Powershell: Method not found: ‘System.Threading.Tasks.Task System.Threading.Tasks.Task.Run(System.Action)’


when you tried to start powershell and the window opens and closes immediately.

Open a cmd and start powershell by calling powershell.exe

C:\> powershell.exe
Windows PowerShell terminated with the following error:
 Could not load type 'System.Management.Automation.Runspaces.EarlyStartup' from assembly 'System.Management.Automation, Version='.
"System.Management.Automation.Tracing.PSEtwLog' threw an exception"

This error occures if Windows Management Framework 5.1 is installed and not the previous Verions 4 or 5.0 on which it depends or .NET Framework is corrupt.

Uninstall Windows Management Versions 5.1 and 5.0 and install install the latest 4.xx Version of .NET Framework , then Windows Management Version 4, 5.0 and 5.1.


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