MSIX Package throwing error while launching.

Priyanka_Aggarwal 

You'll need to debug the problem a bit deeper than looking at the error messages.  I would recommend either a Process Monitor trace or using the Psf TraceFixup (along with PsfMonitor) to view what is going on and better understand the underlying problem.

The two dialogs look to be settings/data not found and dll not found issues.  The former often occur due to working directory issues or settings/data placed in the user's Appdata folders.  The latter could be working directory or App Path issues, but other causes might be present. 

Some of these kind of issues can be solved by the Psf and FileRedirectionFixup.  But start with understanding why it is failing first.