Warning Icon for cs file in solution explorer

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I started getting a warning Icon for nearly every file I am editing

enter image description here

Now this seems like a bug, because my code works normally, and the icon goes away if I restart Visual Studio.

Does anyone have an idea what could cause it? What does this icon even mean? and if by any chance, does anyone knows how to fix it?

For the record, I am using Visual Studio 2017 with the latest release update.

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