I am getting below error while installing sitecore 9.01.

Error Code: ERROR_APPPOOL_VERSION_MISMATCH More Information: The application pool that you are trying to use has the 'managedRuntimeVersion' property set to ''. This application requires 'v4.0'. Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_APPPOOL_VERSION_MISMATCH.

In application pool xconnect status is stopped and .net clr version is no managed code.


So set your app pool to use .CLR Runtime 4.0, as the message says.

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