Unable to open PVS Console after upgrade to PVS 7.17 with error

An unhandled exception occurred and the application will exit. Please report the information below. Press Ctrl-C to copy the data to the clipboard.
Method not found: '!!0[] System.Array.Empty()'.
Stack Trace:
at ADSupport.PublicFunctions.GetOneTimeADInfo() at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()


 

1. Install Microsoft .Net Framework 4.6.1 on the PVS Servers
2. Reboot the PVS servers
3. Open the Console again. 

Problem Cause