The version of clr.dll does not match the one mscordacwks.dll was built for

Question

I have a C# console app in Visual Studio 2010 that I can run just fine. When I attempt to run the process in debug mode, I am presented with the following error:

I have tried searching for any information, but I haven't been able to find anything. Can anyone provide clues as to why I can't run this with the debugger?

EDIT: I should clarify that I have been able to successfully debug a console app previously, this is a new situation.

Answer 1

From what I can tell when I'm able to reproduce this error, it is caused by being in the middle of installing Windows updates. So, running updates, then postponing a reboot, then attempting to debug code is what was putting me in this broken state.

Answer 2

I had this issue once and it was caused by an pending Windows Update on the Server where the process was running, which I wanted to attach.

Answer 3

I encountered the same issue. It happened to me when I attempted to attach to a process for debugging purposes. At the time I had postponed a pending windows update.

Everything started working fine after I restarted my computer and allowed the update to take place.

Additional notes: I had recently updated to Visual Studio 2010 Ultimate and installed its Service Pack 1.

Answer 4

I had this when I installed .NET 4.6 for Visual Studio 2013.

In this particular case, restarting Visual Studio 2013 solved the problem.