Hi rebmaamberrebmaamber,
Is it related to the WCF or Web app?
Could you find this assembly in your solution explorer window->Reference folder?
Maybe you could remove and re-add it again, and then set the copy local=true, debug it.
Not very sure that which VS version you use, but please also make sure that it was not related to the .NET Framework version.
Since you get this issue during you run this app, it would be not the VS debugger issue, if above suggestions still have no help, just tell me the real project type, I will help you find a more appropriate developing forum.
Best Regards,
Jack
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