+1  A: 

This looks like the same problem someone else posted about on the MSDN Azure forum. Their problem was that a resource was being copied into the project with:

  • build action = Content
  • Copy to Output Directory = Copy if Newer.

They changed the latter to Never and the problem went away.

David Makogon
+1  A: 

Happened to me before... try restarting the computer (I know... it's a bit "Technical Support" advice - but it worked for me!

Nissim