VS2015 [Failure] Could not find file '..\obj\Debug\TemporaryGeneratedFile

I recently noticed that one of my projects upon opening it will show a bunch of [Failure] Could not find file messages in the output window.
Example:

Code:

[Failure] Could not find file 'C:\Visual Studios\FormFiller\DataSetBuilder\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs'.

Attachment 133815

I'm able to Clean, Build, & Run the app just fine, but I'm curious to why all these generated files can't be found, nothing in the code even uses files like that but VS seems to expect them to be there.

Interesting note: the only place these files are referenced is in the project's vs14\.suo file.
I've deleted all of the bin & obj folders then deleted the .suo file, when I open the project after that I don't get any messages in the Output window however if I close VS then open it a 2nd time I get all of those messages again.. does anyone have any idea to why this is happening?

VS2015 [Failure] Could not find file '..\obj\Debug\TemporaryGeneratedFile_<GUID>.cs'.