SquaredUp cannot start due to an error (after upgrade)

Af the moment we run version 5.7.1.9085 and we would like to upgrade to the lastest version 6.4.
At the end of the installation we get an error. See below.
Also we get an error at the dashboard: SquaredUp cannot start due to an error

System.InvalidOperationException: Exception during startup sequence —> System.InvalidOperationException: Startup failed for ‘PowerShell’ —> System.NullReferenceException: Object reference not set to an instance of an object.
at SquaredUp.App.Core.Configuration.JsonEncryption.Decrypt(String filename, Byte encrypted)
at SquaredUp.App.Core.Configuration.Bytes.EncryptedJsonBytes.FromBytes(String filename, Byte bytes)
at SquaredUp.App.Core.Configuration.Accessor.ExtensionPackAccessor.Load(String filename, IFileVersion& version)
at SquaredUp.App.Core.Configuration.ConfigurationView.InitializeLazy()
at SquaredUp.App.Core.Configuration.ConfigurationView…ctor(IAbsoluteTime time, IAccessor access, String filename, Boolean lazy)
at SquaredUp.App.Core.Configuration.PackProvider.Create(String filename, Object defaults, Boolean applyMachineRedirect)
at SquaredUp.App.Core.PowerShell.PowerShellStartupStep.Start(IBackgroundTaskControl tasks)
at SquaredUp.App.Core.Startup.Startup.d__8.MoveNext()
— End of inner exception stack trace —
at SquaredUp.App.Core.Startup.Startup.d__8.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at SquaredUp.App.Core.Startup.Startup.d__6.MoveNext()
— End of inner exception stack trace —
at SquaredUp.App.Core.Startup.Startup.d__6.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at SquaredUp.App.Core.Startup.Startup.<>c.<b__4_0>d.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Hosting.BackgroundWorkScheduler.d__7.MoveNext()

What can I do to fix this?

Is it for Dashboard Server Community edition or DS SCOM edition?

This is DS SCOM edition.

This is a clear 1-800-Call-Support case, if not already done.

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Eventually we had to migrate our environment to a new installation. Few hours of work but it works now!