So here\'s my pickle. I\'m using Visual Studion 2012 and been developing my application without a hitch. I opened VS today and I can open all the files as I normally would (cs
I had this same error and it was caused by my dlls in one project not getting up to date with another project dependency. I tried rebuilding, deleting bin files, clearing cache and a few other things. None of it worked for me.
Here is a simple example of my scenario. Project A was dependent on Project B. Whenever Project A hit a point in debugging where it called a method in project B I received the error.
What worked to fix my issue:
Now you should be able to step through both project's code.