Exception from HRESULT: 0x80131040









Background:
I just recently upgraded to Windows 10, and I must confess, the overall experience immediately got me. I love the fact that our good old start menu was back and better. The tile one was much of a controversy although I have been indifferent about it all the while. I particularly love Cortana, the search assistant who made me remember the office assistants that used to come with the office suite back then. The euphoria I experience was a perfect disguise, however, for the ambush that was ahead.


Issue:
I went ahead to open VisualStudio and launched the project I was currently working on. I pressed F5 to launch it, only to ram into a jam! The project I still successfully tested only a day before now threw an exception. From my experience, and this situation hasn't proved me wrong, every Microsoft upgrade always has a catch somewhere. This particular one forced me to begin to rectify a fault in an application that was initially 'bug-free' before my upgrade. The error message looked like this:

Server Error in '/' Application
Could not load file or assembly 'bts_school (1)' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)


Solution:
Well after lots of research and trials I simply resolved the issue by deleting the application's DLL file from the bin folder. I particularly noticed that for whatever reason, the system created a copy, hence the bts_school (1) seen above in the error message. I deleted the main DLL and the copies including the PDB files, then I rebuilt the solution. It worked after that.

I've since been wondering how a simple upgrade to Windows 10 went ahead to confuse VisualStudio, but I'm indeed glad to have my application up and running again!

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