"Error: Unable to read from the cluster database" During upgrading Exchange2013 CU18.

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Error:
The following error was generated when "$error.Clear();
$name = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxUniqueName;
$dispname = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxDisplayName;
$dismbx = get-mailbox -Filter {name -eq $name} -IgnoreDefaultScope -resultSize 1;
if( $dismbx -ne $null)
{
$srvname = $dismbx.ServerName;
if( $dismbx.Database -ne $null -and $RoleFqdnOrName -like "$srvname.*" )
{
Write-ExchangeSetupLog -info "Setup DiscoverySearchMailbox Permission.";
$mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true };
if( $mountedMdb -eq $null )
{
Write-ExchangeSetupLog -info "Mounting database before stamp DiscoverySearchMailbox Permission...";
mount-database $dismbx.Database;
}

$mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true };
if( $mountedMdb -ne $null )
{
$dmRoleGroupGuid = [Microsoft.Exchange.Data.Directory.Management.RoleGroup]::DiscoveryManagement_InitInfo.WellKnownGuid;
$dmRoleGroup = Get-RoleGroup -Identity $dmRoleGroupGuid -DomainController $RoleDomainController -ErrorAction:SilentlyContinue;
if( $dmRoleGroup -ne $null )
{
trap [Exception]
{
Add-MailboxPermission $dismbx -User $dmRoleGroup.Name -AccessRights FullAccess -DomainController $RoleDomainController -ErrorAction SilentlyContinue;
continue;
}

Add-MailboxPermission $dismbx -User $dmRoleGroup.Identity -AccessRights FullAccess -DomainController $RoleDomainController -WarningAction SilentlyContinue;
}
}
}
}
" was run: "System.InvalidOperationException: Failed to mount database "Mailbox Database 0624540394". Error: An Active Manager operation failed. Error: An Active Manager operation encountered an error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have quorum. Error: Unable to read from the cluster database. This may occur if the server has recently been removed from the database availability group. [Server: WPAQAEXCH13MBX2.QA.WPA.LOCAL] ---> Microsoft.Exchange.Data.Storage.AmOperationNotValidOnCurrentRole: An Active Manager operation failed. Error: An Active Manager operation encountered an error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have quorum. Error: Unable to read from the cluster database. This may occur if the server has recently been removed from the database availability group. [Server: WPAQAEXCH13MBX2.QA.WPA.LOCAL]
at Microsoft.Exchange.Data.Storage.ActiveManager.AmRpcClientHelper.GetPrimaryActiveManager(IADDatabaseAvailabilityGroup dag, IADToplogyConfigurationSession adSession)
at Microsoft.Exchange.Data.Storage.ActiveManager.AmRpcClientHelper.GetServerToPerformDatabaseOperation(IADDatabase database, String targetServer)
at Microsoft.Exchange.Data.Storage.ActiveManager.AmRpcClientHelper.RunDatabaseRpcWithReferral(AmRpcOperationHint rpcOperationHint, IADDatabase database, String targetServer, InternalRpcOperation rpcOperation)
at Microsoft.Exchange.Management.SystemConfigurationTasks.MountDatabase.RequestMount(MountFlags storeMountFlags)
at Microsoft.Exchange.Management.SystemConfigurationTasks.MountDatabase.InternalProcessRecord()
--- End of inner exception stack trace ---
at Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl)
at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)
at Microsoft.Exchange.Management.SystemConfigurationTasks.MountDatabase.InternalProcessRecord()
at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()
at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".

 

Attached the screen.

 

Could anyone suggest me how to fix this issue?

 

Thanks

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