I have a very similar issue, but in my case it is with the Amazon Web Services SDK instead of the Facebook SDK. For me the problem turned out to be related to my framework load path.
Solution: Go to "Build Settings" in Xcode, and under "Search Paths" there is a "Framework Search Paths" item. Double-click it and add a new search path: .
and make it recursive. Clean and build.
This assumes that your framework is stored somewhere inside your project directory. If not, change the new search path as needed.
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