adding ShareKit to my project, won't compile - 4,448 errors

I can get the ShareKit demo from github to compile using the iOS 4.1 SDK, but when I import it into my project exactly how it's described on the ShareKit site, after compiling I'm getting 4,448 errors. It looks like I'm missing a framework, but I have the required frameworks listed. Maybe there's some kind of framework conflict. Here are some screenshots:

The frameworks:

Has anyone else seen this before? Thanks!

Looks like you're trying to compile a pure-C file with some Objective-C mixed in. I'd make sure that all the files have a source type of "sourcecode.c.objc" (which you can do by selecting the file and typing cmd-i)