CocoaPods – Broken Specs Repository

If you are using CocoaPods and a recent pod install produced a strange result like:

$ pod install
Analyzing dependencies
[!] Pod::Executable pull
A	AAShareBubbles/1.0.2/AAShareBubbles.podspec
A	ABContactHelper/0.1/ABContactHelper.podspec
A	ABPadLockScreen/3.0.0/ABPadLockScreen.podspec
A	wpxmlrpc/0.4/wpxmlrpc.podspec
A	ym/1.2.6/ym.podspec
A	zipzap/6.0/zipzap.podspec
Pull is not possible because you have unmerged files.
Please, fix them up in the work tree, and then use 'git add/rm <file>'
as appropriate to mark resolution, or use 'git commit -a'.

resetting the repository might help:

$ pod repo remove master
$ pod setup