Question : Consider adding a reference to assembly

Consider adding a reference to assembly `System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’

where do i do this in unity?

from all the search i did it always came back to “web.config” i dont have that file.

how can i add this reference?

thank you

Well after long searching i gave up. I deceided to downgrade the entire app to .net 3.5

even after i could add the reference in mono develop the error would not go away.
I tried so many thing like updating SKD’s, reinstalling unity, manualy adding the reference.
nothing worked.

so i gave up on the Net 4.6 build.

In the same situation. I’m about to give up as well… So long waited 4.6 and it is a failure so far with 2017.1, 2017.2, 2017.3