Updating RestKit to master

I updated to master and I'm not able 开发者_StackOverflow中文版to load new classes like RKObjectMapping. I went through the install instructions again and reviewed the example projects but still can't figure it out. Why wouldn't XCode know about RKObjectMapping when I include ?

I had this problem as well.

From this thread on the RestKit group:

1. Close the project
2. Open Window->Organizer
3. Under Projects tab, delete DerivedData for your project
4. Quit Xcode and Relaunch
5. Open the project
6. Clean and rebuild

Everything should work.