No EditorOptionDefinition Export Found Error

Question

In Visual Studio 2013 I started getting the following error when trying to open C# files:

No EditorOptionDefinition export found for the given option name:
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Answer 1

I had this problem,

Now I use Windows 8.1 and VS Express 2013 for web. Renaming the folder didn't help as it didn't change when I re-started VS. Repairing the programme didn't help nor did restarting the computer.

What worked for me was just a basic uninstall & reinstall, sometimes a bit of common sense is needed :)