No EditorOptionDefinition Export Found Error

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:
Tabs/ConvertTabsToSpaces
Parameter name: optionID

I was having no issues all morning until I closed and re-opened a C# solution I was working on when this error started. I checked and this error happens when I open any C# project on this computer. I also tried opening the same project from my other computer and it works fine, so this is not a project error.

I have not changed any VS settings, and I was just trying to open the package manager when this presented itself.

I am at a loss and Dr. Google is not of much help thus far.

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