WatchOS 2: “Cannot Install Watch App” “Error Launching 'TestApp WatchKit App Extension'”

Question

I am getting a AlertView popup error on iOS every time I try to install a watchOS 2 app in Xcode 7 beta 4:

Cannot Install Watch App<

Answer 1

Looking through the device system logs, I found my issue:

Jul 26 18:05:14 MacBook-Pro companionappd[22461]: (Error) WatchKit: validateWatchKitApplicationInfoDictionary, invalid Info.plist key 'NSAppTransportSecurity'

I had an App Transport Security key set on both the watchOS app info.plist and the watchOS extension info.plist. It should only be set on the extension.