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%3CLINGO-SUB%20id%3D%22lingo-sub-302630%22%20slang%3D%22en-US%22%3ERe%3A%20Teams%20Desktop%20App%20not%20starting%20any%20more%20(on%20Windows%2010)%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-302630%22%20slang%3D%22en-US%22%3EI%20had%20the%20same%20problem%2C%20several%20days%20before.%20Removing%20all%20data%2C%20like%20Adam%20wrote%20helps%20for%20me.%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-302384%22%20slang%3D%22en-US%22%3ERe%3A%20Teams%20Desktop%20App%20not%20starting%20any%20more%20(on%20Windows%2010)%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-302384%22%20slang%3D%22en-US%22%3ELooking%20briefly%20at%20the%20log%2C%20it%E2%80%99s%20either%20a%20registry%20hanging%20around%20ruining%20your%20installation%20or%20it%E2%80%99s%20a%20corrupt%20OS%2Ffile%20system%3CBR%20%2F%3ETry%20find%2F%20remove%20the%20registry%20keys%20mentioned%20in%20the%20log!%20Just%20make%20sure%20not%20to%20remove%20or%20edit%20something%20else!%20Find%20anything%20with%20Microsoft%20teams%20and%20remove%20it!%20Remove%20all%20the%20files%20I.%20The%20patches%20the%20log%20mentions%20again!%20Download%20the%20teams%20client%20again%20And%20try%20again...%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-302370%22%20slang%3D%22en-US%22%3ERe%3A%20Teams%20Desktop%20App%20not%20starting%20any%20more%20(on%20Windows%2010)%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-302370%22%20slang%3D%22en-US%22%3E%3CP%3EI%20tried.%20Unfortunately%20it%20didn't%20work.%20Teams%20still%20does%20not%20come%20up%20and%20there%20is%20still%20no%20Teams%20process%20running%2C%20too.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3ESquirrelSetup.log%20in%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CSquirrelTemp%20seems%20to%20show%20some%20errors.%3C%2FP%3E%3CPRE%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20Starting%20Squirrel%20Updater%3A%20--install%20.%20--exeName%3DTeams_windows_x64.exe%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20setup.json%20does%20not%20exist%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20Starting%20install%2C%20writing%20to%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CSquirrelTemp%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20UpdateManager%3A%20using%20rootAppDirecotry%3A%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20About%20to%20install%20to%3A%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20Setup.json%20exist%2C%20copying%20over%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20File%20does%20not%20contain%20contextual%20info%3A%20Teams_windows_x64.exe%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20RegistryService%3A%20RegKeyExists%3A%20HKEY_LOCAL_MACHINE%5CSoftware%5CWOW6432Node%5CMicrosoft%5CWindows%5CCurrentVersion%5CRun%20does%20not%20have%20TeamsMachineInstaller%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20Program%3A%20CheckMsiAndTryAddInstallSource%3A%20Not%20MSI%2C%20no%20need%20to%20add%20HKEY_CURRENT_USER%5CSoftware%5CMicrosoft%5COffice%5CTeams%5CInstallSource%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20CheckForUpdateImpl%3A%20Couldn't%20write%20out%20staging%20user%20ID%2C%20this%20user%20probably%20shouldn't%20get%20beta%20anything%3A%20System.IO.DirectoryNotFoundException%3A%20Could%20not%20find%20a%20part%20of%20the%20path%20'C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%5Cpackages%5C.betaId'.%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.__Error.WinIOError(Int32%20errorCode%2C%20String%20maybeFullPath)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.FileStream.Init(String%20path%2C%20FileMode%20mode%2C%20FileAccess%20access%2C%20Int32%20rights%2C%20Boolean%20useRights%2C%20FileShare%20share%2C%20Int32%20bufferSize%2C%20FileOptions%20options%2C%20SECURITY_ATTRIBUTES%20secAttrs%2C%20String%20msgPath%2C%20Boolean%20bFromProxy%2C%20Boolean%20useLongPath%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.FileStream..ctor(String%20path%2C%20FileMode%20mode%2C%20FileAccess%20access%2C%20FileShare%20share%2C%20Int32%20bufferSize%2C%20FileOptions%20options%2C%20String%20msgPath%2C%20Boolean%20bFromProxy%2C%20Boolean%20useLongPath%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.StreamWriter.CreateFile(String%20path%2C%20Boolean%20append%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.StreamWriter..ctor(String%20path%2C%20Boolean%20append%2C%20Encoding%20encoding%2C%20Int32%20bufferSize%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.File.InternalWriteAllText(String%20path%2C%20String%20contents%2C%20Encoding%20encoding%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.File.WriteAllText(String%20path%2C%20String%20contents%2C%20Encoding%20encoding)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20CheckForUpdateImpl%3A%20Failed%20to%20load%20local%20releases%2C%20starting%20from%20scratch%3A%20System.IO.DirectoryNotFoundException%3A%20Could%20not%20find%20a%20part%20of%20the%20path%20'C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%5Cpackages%5CRELEASES'.%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.__Error.WinIOError(Int32%20errorCode%2C%20String%20maybeFullPath)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.FileStream.Init(String%20path%2C%20FileMode%20mode%2C%20FileAccess%20access%2C%20Int32%20rights%2C%20Boolean%20useRights%2C%20FileShare%20share%2C%20Int32%20bufferSize%2C%20FileOptions%20options%2C%20SECURITY_ATTRIBUTES%20secAttrs%2C%20String%20msgPath%2C%20Boolean%20bFromProxy%2C%20Boolean%20useLongPath%2C%20Boolean%20checkHost)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.IO.FileStream..ctor(String%20path%2C%20FileMode%20mode%2C%20FileAccess%20access%2C%20FileShare%20share)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.Utility.LoadLocalReleases(String%20localReleaseFile)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.UpdateManager.CheckForUpdateImpl.%3CCHECKFORUPDATE%3Ed__2.MoveNext()%3CBR%20%2F%3E2018-12-15%2022%3A08%3A19%26gt%3B%20CheckForUpdateImpl%3A%20Reading%20RELEASES%20file%20from%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CSquirrelTemp%3CBR%20%2F%3E2018-12-15%2022%3A08%3A20%26gt%3B%20CheckForUpdateImpl%3A%20First%20run%20or%20local%20directory%20is%20corrupt%2C%20starting%20from%20scratch%3CBR%20%2F%3E2018-12-15%2022%3A08%3A20%26gt%3B%20ApplyReleasesImpl%3A%20getting%20squirrel%20aware%20apps%20failed%20with%20exception%20Could%20not%20find%20a%20part%20of%20the%20path%20'C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%5Ccurrent'.%3CBR%20%2F%3E2018-12-15%2022%3A08%3A20%26gt%3B%20ApplyReleasesImpl%3A%20Writing%20files%20to%20app%20directory%3A%20C%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%5Ccurrent%3CBR%20%2F%3E2018-12-15%2022%3A08%3A23%26gt%3B%20ApplyReleasesImpl%3A%20Squirrel%20Enabled%20Apps%3A%20%5BC%3A%5CUsers%5Crja%5CAppData%5CLocal%5CMicrosoft%5CTeams%5Ccurrent%5CTeams.exe%5D%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Starting%20fixPinnedExecutables%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20Evernote.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20File%20Explorer%20(2).lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20File%20Explorer.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20Mozilla%20Firefox.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20Outlook.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20Pulse%20Secure.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Examining%20Pin%3A%20Skype%20for%20Business%202016.lnk%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Fixing%20up%20tray%20icons%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Couldn't%20rewrite%20shim%20RegKey%2C%20most%20likely%20no%20apps%20are%20shimmed%3A%20System.NullReferenceException%3A%20Object%20reference%20not%20set%20to%20an%20instance%20of%20an%20object.%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.UpdateManager.ApplyReleasesImpl.%3CUNSHIMOURSELVES%3Eb__17_0(RegistryView%20view)%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20ApplyReleasesImpl%3A%20Couldn't%20rewrite%20shim%20RegKey%2C%20most%20likely%20no%20apps%20are%20shimmed%3A%20System.NullReferenceException%3A%20Object%20reference%20not%20set%20to%20an%20instance%20of%20an%20object.%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.UpdateManager.ApplyReleasesImpl.%3CUNSHIMOURSELVES%3Eb__17_0(RegistryView%20view)%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20MeetingAddinInstaller%3A%20System.ArgumentException%3A%20Cannot%20delete%20a%20subkey%20tree%20because%20the%20subkey%20does%20not%20exist.%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20System.ThrowHelper.ThrowArgumentException(ExceptionResource%20resource)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String%20subkey%2C%20Boolean%20throwOnMissingSubKey)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String%20subkey)%3CBR%20%2F%3E%26nbsp%3B%26nbsp%3B%20at%20Squirrel.MeetingAddinInstaller.%3CINSTALLMEETINGADDINASYNC%3Ed__14.MoveNext()%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20MeetingAddinInstaller%3A%20StagedAppDirectory%20does%20not%20exist.%20Using%20Current%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20MeetingAddinInstaller%3A%20Version%3A%201.0.18317.2%3B%20addinPackageDirectory%3A%201.0.18317.2%3CBR%20%2F%3E2018-12-15%2022%3A08%3A29%26gt%3B%20MeetingAddinInstaller%3A%20.dead%20exists%3A%20False%3CBR%20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RickJanda
New Contributor

Hi,

 

Since a couple of days the MS Teams desktop app is not starting any more on my Windows 10 system.

I tried complete uninstall and re-installation already but it did not help.

 

SquirrelSetup.log in C:\Users\rja\AppData\Local\Microsoft\Teams just adds these 3 lines

2018-12-13 21:58:29> Program: Starting Squirrel Updater: --processStart Teams.exe
2018-12-13 21:58:29> Program: Want to launch 'C:\Users\rja\AppData\Local\Microsoft\Teams\current\Teams.exe'
2018-12-13 21:58:29> Program: About to launch: 'C:\Users\rja\AppData\Local\Microsoft\Teams\current\Teams.exe':

with every new starting attempt but nothing happened then. (whole file attached)

 

C:\Users\rja\AppData\Local\Microsoft\Teams\current\SquirrelSetup.log just contains this single line:

2018-12-13 21:57:05> Program: Starting Squirrel Updater: 

 

No system tray icon there and also no Teams process running according Task Manager.

 

Any idea how to fix this?

 

Kind regards, Rick

20 Replies
Solution
Hi!

Uninstall again and remove files from the following locations:

%LocalAppData%\Microsoft\Teams
%LocalAppData%\Microsoft\TeamsMeetingsAddin
%AppData%\Microsoft\Teams
%LocalAppData%\SquirrelTemp

After that try to install again!

/ Adam

I tried. Unfortunately it didn't work. Teams still does not come up and there is still no Teams process running, too.

 

SquirrelSetup.log in C:\Users\rja\AppData\Local\SquirrelTemp seems to show some errors.

2018-12-15 22:08:19> Program: Starting Squirrel Updater: --install . --exeName=Teams_windows_x64.exe
2018-12-15 22:08:19> Program: setup.json does not exist
2018-12-15 22:08:19> Program: Starting install, writing to C:\Users\rja\AppData\Local\SquirrelTemp
2018-12-15 22:08:19> UpdateManager: using rootAppDirecotry: C:\Users\rja\AppData\Local\Microsoft\Teams
2018-12-15 22:08:19> Program: About to install to: C:\Users\rja\AppData\Local\Microsoft\Teams
2018-12-15 22:08:19> Program: Setup.json exist, copying over
2018-12-15 22:08:19> Program: File does not contain contextual info: Teams_windows_x64.exe
2018-12-15 22:08:19> RegistryService: RegKeyExists: HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run does not have TeamsMachineInstaller
2018-12-15 22:08:19> Program: CheckMsiAndTryAddInstallSource: Not MSI, no need to add HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\InstallSource
2018-12-15 22:08:19> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\packages\.betaId'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)
   at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)
   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost)
   at System.IO.File.WriteAllText(String path, String contents, Encoding encoding)
   at Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()
2018-12-15 22:08:19> CheckForUpdateImpl: Failed to load local releases, starting from scratch: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\packages\RELEASES'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at Squirrel.Utility.LoadLocalReleases(String localReleaseFile)
   at Squirrel.UpdateManager.CheckForUpdateImpl.<CheckForUpdate>d__2.MoveNext()
2018-12-15 22:08:19> CheckForUpdateImpl: Reading RELEASES file from C:\Users\rja\AppData\Local\SquirrelTemp
2018-12-15 22:08:20> CheckForUpdateImpl: First run or local directory is corrupt, starting from scratch
2018-12-15 22:08:20> ApplyReleasesImpl: getting squirrel aware apps failed with exception Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\current'.
2018-12-15 22:08:20> ApplyReleasesImpl: Writing files to app directory: C:\Users\rja\AppData\Local\Microsoft\Teams\current
2018-12-15 22:08:23> ApplyReleasesImpl: Squirrel Enabled Apps: [C:\Users\rja\AppData\Local\Microsoft\Teams\current\Teams.exe]
2018-12-15 22:08:29> ApplyReleasesImpl: Starting fixPinnedExecutables
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: Evernote.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: File Explorer (2).lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: File Explorer.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: Mozilla Firefox.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: Outlook.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: Pulse Secure.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Examining Pin: Skype for Business 2016.lnk
2018-12-15 22:08:29> ApplyReleasesImpl: Fixing up tray icons
2018-12-15 22:08:29> ApplyReleasesImpl: Couldn't rewrite shim RegKey, most likely no apps are shimmed: System.NullReferenceException: Object reference not set to an instance of an object.
   at Squirrel.UpdateManager.ApplyReleasesImpl.<unshimOurselves>b__17_0(RegistryView view)
2018-12-15 22:08:29> ApplyReleasesImpl: Couldn't rewrite shim RegKey, most likely no apps are shimmed: System.NullReferenceException: Object reference not set to an instance of an object.
   at Squirrel.UpdateManager.ApplyReleasesImpl.<unshimOurselves>b__17_0(RegistryView view)
2018-12-15 22:08:29> MeetingAddinInstaller: System.ArgumentException: Cannot delete a subkey tree because the subkey does not exist.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey, Boolean throwOnMissingSubKey)
   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey)
   at Squirrel.MeetingAddinInstaller.<InstallMeetingAddinAsync>d__14.MoveNext()
2018-12-15 22:08:29> MeetingAddinInstaller: StagedAppDirectory does not exist. Using Current
2018-12-15 22:08:29> MeetingAddinInstaller: Version: 1.0.18317.2; addinPackageDirectory: 1.0.18317.2
2018-12-15 22:08:29> MeetingAddinInstaller: .dead exists: False
2018-12-15 22:08:29> MeetingAddinInstaller: path to .dead: C:\Users\rja\AppData\Local\Microsoft\TeamsMeetingAddin\1.0.18317.2\.dead
2018-12-15 22:08:29> MeetingAddinInstaller: before cleanup unused versions
2018-12-15 22:08:29> MeetingAddinInstaller: Addin directory exists. Copy was successful
2018-12-15 22:08:29> MeetingAddinInstaller: Version 1.0.18317.2 of the meeting add-in is now installed
2018-12-15 22:08:29> ApplyReleasesImpl: cleanDeadVersions: for version 1.1.00.31860
2018-12-15 22:08:29> ApplyReleasesImpl: cleanDeadVersions: exclude folder stage
2018-12-15 22:09:08> Program: Starting Squirrel Updater: --install . --exeName=Teams_windows_x64.exe
2018-12-15 22:09:08> Program: Starting install, writing to C:\Users\rja\AppData\Local\SquirrelTemp
2018-12-15 22:09:08> UpdateManager: using rootAppDirecotry: C:\Users\rja\AppData\Local\Microsoft\Teams
2018-12-15 22:09:08> Program: About to install to: C:\Users\rja\AppData\Local\Microsoft\Teams
2018-12-15 22:09:08> Program: Install path C:\Users\rja\AppData\Local\Microsoft\Teams already exists, burning it to the ground
2018-12-15 22:09:10> Program: Setup.json exist, copying over
2018-12-15 22:09:10> Program: File does not contain contextual info: Teams_windows_x64.exe
2018-12-15 22:09:10> RegistryService: RegKeyExists: HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run does not have TeamsMachineInstaller
2018-12-15 22:09:10> Program: CheckMsiAndTryAddInstallSource: Not MSI, no need to add HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\InstallSource
2018-12-15 22:09:10> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\packages\.betaId'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)
   at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)
   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost)
   at System.IO.File.WriteAllText(String path, String contents, Encoding encoding)
   at Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()
2018-12-15 22:09:10> CheckForUpdateImpl: Failed to load local releases, starting from scratch: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\packages\RELEASES'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at Squirrel.Utility.LoadLocalReleases(String localReleaseFile)
   at Squirrel.UpdateManager.CheckForUpdateImpl.<CheckForUpdate>d__2.MoveNext()
2018-12-15 22:09:10> CheckForUpdateImpl: Reading RELEASES file from C:\Users\rja\AppData\Local\SquirrelTemp
2018-12-15 22:09:10> CheckForUpdateImpl: First run or local directory is corrupt, starting from scratch
2018-12-15 22:09:10> ApplyReleasesImpl: getting squirrel aware apps failed with exception Could not find a part of the path 'C:\Users\rja\AppData\Local\Microsoft\Teams\current'.
2018-12-15 22:09:10> ApplyReleasesImpl: Writing files to app directory: C:\Users\rja\AppData\Local\Microsoft\Teams\current
2018-12-15 22:09:13> ApplyReleasesImpl: Squirrel Enabled Apps: [C:\Users\rja\AppData\Local\Microsoft\Teams\current\Teams.exe]
2018-12-15 22:09:19> ApplyReleasesImpl: Starting fixPinnedExecutables
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: Evernote.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: File Explorer (2).lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: File Explorer.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: Mozilla Firefox.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: Outlook.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: Pulse Secure.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Examining Pin: Skype for Business 2016.lnk
2018-12-15 22:09:19> ApplyReleasesImpl: Fixing up tray icons
2018-12-15 22:09:19> ApplyReleasesImpl: Couldn't rewrite shim RegKey, most likely no apps are shimmed: System.NullReferenceException: Object reference not set to an instance of an object.
   at Squirrel.UpdateManager.ApplyReleasesImpl.<unshimOurselves>b__17_0(RegistryView view)
2018-12-15 22:09:19> ApplyReleasesImpl: Couldn't rewrite shim RegKey, most likely no apps are shimmed: System.NullReferenceException: Object reference not set to an instance of an object.
   at Squirrel.UpdateManager.ApplyReleasesImpl.<unshimOurselves>b__17_0(RegistryView view)
2018-12-15 22:09:19> MeetingAddinInstaller: System.ArgumentException: Cannot delete a subkey tree because the subkey does not exist.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey, Boolean throwOnMissingSubKey)
   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey)
   at Squirrel.MeetingAddinInstaller.<InstallMeetingAddinAsync>d__14.MoveNext()
2018-12-15 22:09:19> MeetingAddinInstaller: StagedAppDirectory does not exist. Using Current
2018-12-15 22:09:19> MeetingAddinInstaller: Version: 1.0.18317.2; addinPackageDirectory: 1.0.18317.2
2018-12-15 22:09:19> MeetingAddinInstaller: Version 1.0.18317.2 of the meeting add-in is already installed
2018-12-15 22:09:19> ApplyReleasesImpl: cleanDeadVersions: for version 1.1.00.31860
2018-12-15 22:09:19> ApplyReleasesImpl: cleanDeadVersions: exclude folder stage

 

Any other file I could attach in order to analyze the issue?

 

Kind regards, Rick

Looking briefly at the log, it’s either a registry hanging around ruining your installation or it’s a corrupt OS/file system
Try find/ remove the registry keys mentioned in the log! Just make sure not to remove or edit something else! Find anything with Microsoft teams and remove it! Remove all the files I. The patches the log mentions again! Download the teams client again And try again...
I had the same problem, several days before. Removing all data, like Adam wrote helps for me.

I've been experiencing the same thing, start Teams and it's process will load for a second then quietly crash with no ui.  Tried loading from command prompt, no output.  Since Teams is built on Electron it's a version of Chromium loading so can use the Chrome cmdline options:

https://peter.sh/experiments/chromium-command-line-switches/

 

Where I found this:

Teams.exe --enable-logging

 

Which then showed this in the command prompt:

[20872:0618/121521.967:ERROR:process_singleton_win.cc(300)] Lock file can not be created! Error code: 5
[700:0618/121522.405:ERROR:broker_win.cc(57)] Error reading broker pipe: The pipe has been ended. (0x6D)

 

From searching i believe it's something to do with the second error.  Haven't found a solution yet.

 

Edit: The above error appears to be a very low level Chrome thing with no easy fix

 

OK so no cure but I know what's going on.  The lock file is basically there to say "If I can't create a lock file, that means another copy of teams is already open so quit" .  That explains why the app just quits without errors etc.  I however don't know  why it can't create the lock file.

I have been relying on the Teams web app for the last month. I am experiencing the exact symptoms described above. I have uninstalled, deleted, scrubbed files, etc. Team acts like it's going to launch, and then fails quietly with no UI. Incredibly frustrating to have developed an organizational dependency on this client and then have no fix available.

 

I don't have the issue, nor does anyone else in my org, something has to be specific to your setups.
Chris, you do realize there is nothing in this response that is in any way helpful with regard to resolving my issue. I am happy for you and your org. Any actionable suggestions regarding my problem?
I had this issue only two times since the las two years and always to delete the Desktop app and also delete the cache data helps for me. If you still have Problems, I would open a Support ticket to fix this Problem. best regards Holger
I was responding to that fact that others are working fine with 1903. And na, no more suggestions cause I got other things to do than help people with attitude problems.

@RickJanda this is old and I'm sure you have found a solution but I came across this thread due to the same issue and hadn't found a solution anywhere, so I worked out my own solution that may work for others who come across this thread while googling.

Problem was a corrupted cached password or something of that nature, but none of the efforts to clear it worked (including this thread). In the end, I found that after attempting to launch Teams, in the one second that the icon would appear in the system tray before disappearing, I could right click and click "sign out". After practicing a few times I managed to click on "sign out" before it disappeared, and after that I was able to start Teams and get to the login prompt.

I tried literally hours of possible solutions, including following a, in the end spurious, goose chase in the event log about DCOM permission (10016) events that were flagging as errors when Teams tried to launch.

@pitdroidtech 

Thank you so much. this solved it for me

 

This is a fantastic solution which also worked for me. I guess the moral is: before changing password, remember to sign out of Teams. Many thanks.

Same thing happened to me, then I install Revo Uninstaller, clean all registries and files pertaining to teams with it, then fresh install the Teams.

Voila..

Thanks @pitdroidtech! That solved the problem for me too!

@pitdroidtech great tip, worked for me! (in Windows 7, same problem)

@pitdroidtech 

This is the only solution that works, 

I'ts like a "little game" ;) hidden in teams, have to practice to "log off" in the right time.

thank you..!

@pitdroidtech 

This fixed my issue! Thank you for your help!  Great idea and explanation!  

This worked for me
I was able to use this as well as clearing out the appdata folders, thank you!
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