Installation Failed “Invalid argument” when trying to run Today application extension
问题 I added a vanilla Today Application Extension and run with the new scheme created by XCode. After it finishes building ("Build Succeeded" pops up), it failed straight away with this error: Installation Failed Invalid argument I've been trying to find answers for 6 hours now, no luck so far. Please help! 回答1: Check if the Bundle Identifier isn't empty in the Info.plist 回答2: Try this: Quit Xcode Clean out ~/Library/Developer/Xcode/DerivedData manually rm -rf "$(getconf DARWIN_USER_CACHE_DIR)