no umbrella header found for target, module map will not be generated

Question

When I trying build CKCountdownButton as a framework in Xcode 6.3, it complains with

warning: no umbrella header found for target \'CKCountdownButton\', mod

Answer 1

I had the same problem with 'GoogleToolbox'. It happened when I tried to update my pod repo and some error happened. Just did 'pod install' from terminal on the project folder and everything got ok.