Xcode 6.1 keeps telling me some PartialInfo.plist couldn't be opened

Question

After I upgraded to Xcode 6.1, it kept throwing this exception when I tried to build my existing application. I tried to remove 'MyController' and add back again. But it would throw the same exception with different controller.

could not read data from '/Users/macbookpro/Library/Developer/Xcode/DerivedData/MyApp-
dmhwkhbfbxprhycwjeunwtbbtsxj/Build/Intermediates/MyApp.build/DEV-iphoneos/MyApp.build/MyController-
PartialInfo.plist': The file “MyController-PartialInfo.plist” couldn’t be opened because there is no
such file.

Answer 1

I found the answer. I have to replace all xib files' IBCocoaTouchPlugin to newer version.

<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6244"/>