Installation Failed "Invalid argument" when trying to run Today application extension

Question

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!

Answer 1

Check if the Bundle Identifier isn't empty in the Info.plist

Answer 2

Try this:

1. Quit Xcode
2. Clean out ~/Library/Developer/Xcode/DerivedData manually
3. rm -rf "$(getconf DARWIN_USER_CACHE_DIR)/org.llvm.clang/ModuleCache"
4. iOS Simulator > Reset Content and Settings