I downloaded Xcode 9 beta recently, and when I tried to run my app in the simulator it is not getting installed. I am getting this error in my Xcode every time I try to run
I had a similar issue when installing my App on the IOS simulator (with Xcode 9).
I found the issue (at least for my case), it was due to an unauthorized key (Privacy - Location When In Use Usage Description) in the info.plist of the Watch App.
I have moved this key to the info.plist of the WatchKit Extension and now the App installs again.
I hope it will help others people having the same issue.