Solved: CLR20r3 mtm.exe System.TypeLoadException

System: Windows 7, MS Visual Studio 10 Ultimate

Summary: Error occurs in the Microsoft Test Manager when I try to open or create a new test case.

Error Returned:
Problem signature:
  Problem Event Name: CLR20r3
  Problem Signature 01: mtm.exe
  Problem Signature 02: 10.0.0.0
  Problem Signature 03: 4ba21172
  Problem Signature 04:
Microsoft.TeamFoundation.TestManagement.Activities.Common
  Problem Signature 05: 10.0.0.0
  Problem Signature 06: 4ba21169
  Problem Signature 07: 32
  Problem Signature 08: e
  Problem Signature 09: System.TypeLoadException
  OS Version: 6.1.7601.2.1.0.768.3
  Locale ID: 1033
  Additional Information 1: 0a9e
  Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
  Additional Information 3: 0a9e
  Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Solution:

1. Reapply MS Visual Studio Service Pack 1.

2. Apply the hotfix rollup package that resolves the following issues in Microsoft Test Manager 2010 and that is dated October 2010 from Microsoft Support. Downloaded the KB2387011 fix from Microsoft Connect.

3. Check for related Windows Update and install.

Note:
My Silverlight has been affected by the fixes. The Visual Studio notified me that I needed the correct version of the Silverlight. The link for that was provided. Downloaded and installed the compatible Silverlight version.