Install-SPSolution, Add-SPSolution and Update-SPSolution return error: not supported with version 4.0.30319.269 of the Microsoft .Net Runtime.

Just tried to install a soliution, and I received the error:

Install-SPSolution : Microsoft SharePoint is not supported with version 4.0.30319.269 of the Microsoft .Net Runtime.

I just installed the new PowerShell 3.0. To fix, launch a new powershell with -Version 2, and then run your command again:

powershell -version 2

That is what I get for installing the newest and the greatest!

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