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Q: 

Extender Provider failed to return an Extender

We upgraded from .NET 2.0 to .NET 3.5. A co-worker of mine is getting the following dialog when attempting to run the ASP .NET web project under the debugger in Visual Studio 2008. He can build fine, but he can't debug (hence, it's a run-time issue):

Microsoft Visual Studio

"The Extender Provider failed to return an Extender for this object. Please correct before proceeding. (You might rename the current web.config and add a new one.)"

OK

Searching on this error provided one hit that is in French, but Google translated, and the dude deleted his web.config. Well, my co-worker has a web.config.

Thanks!

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