Can't install WatchKit app on Apple Watch

A friend who works on the USA Today iOS team, including the Apple Watch app, suggested I go to the project settings for the WatchKit App target and set "Skip Install" to NO. Sure enough, after doing this, I was able to install.

I've found it very useful for reading the iPhone console log. (Not to be confused with crash logs).

Use Xcode --> Window --> Devices -- select your plugged in iPhone, and make sure the log screen lower left arrow is down.

In my case, I had invalid provisioning profile entitlements, which were corrected via the Apple Dev portal, and re-downloading the profiles -- after making sure the entitlements were correctly being set in the WatchKit App Capabilities.

Check Info.plist file. In my experience if there is something added there that is not supposed to be there, it will cause this behavior. I added NSLocationWhenInUseUsageDescription and it caused this same issue.