Visual Studio .dll Reference not found?

I had never had this erro开发者_高级运维r before, and I didn't move any file, or exclude any reference.

I'm getting this error (link).

In the ajaxcontroltoolkit.dll.refresh file, I get a path to the DLL, but it is a path that was located in someone else's computer (who no longer is in charge of this).

It might as well work if I just re-do the reference, but what is weird is that I've used this reference before, and had no problems. I don't know what triggered it..

Does anyone have any clue ?

--[UPDATE]--

As expected, I've fixed it, but this question remains unanswered. Besides, the exact same problem with a coworker..

Delete the .refresh file and do a Clean and Rebuild.