visual studio 2012 - "mscorlib.pdb not loaded" yet the mscorlib.dll is NOT missing

Question

I am running my application in VS2012 and I am getting a runtime error;

When I look in the "Original Location" I see mscorlib.dll, but not mscorlib.pdb.

Why is this happening and how do I fix it?

Answer 1

Goto Tools, Options, Debugging, General, Enable Just My Code

This will prevent the debugger from trying to launch on a Internal .NET Framework Assembly.