Red underlining but no error


I just changed computer and installed VS2015.

My projects are running and no problem on VS2013 on my old computer, but opening the same project on VS2015, I have red underlining with message "The type Object is defined in an unreferenced assembly, you should add the reference to assembly "System.Runtime, Version=, ..." "
The code is still compiling without any errors, but the message and the red underlining is still here.
My references are here, that's why it's compiling I guess, but my editor is filled with many "fake errors".

Did anyone face this issue ?
Thank you


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