Ios – Installation Failed “Invalid argument” when trying to run Today application extension

I believe the "Failed to inherit CoreMedia permissions from NNNN" warning is related to App Groups when you are creating an App Extension. Both your containing application and your app extension need to have the App Groups capability turned ON and using the same app group container ID (example: group.com.yourdomain.yourappname). App Groups are used to allow multiple apps access to shared containers and allow additional interprocess communication between apps.

I had this problem with an iPhone app, and fixed it using the following steps.

• With your device connected, and Xcode open, select Window->Devices
• In the left tab of the window that pops up, select your problem device
• In the detail panel on the right, remove the offending app from the "Installed Apps" list.

After I did that, my app rebuilt and launched just fine. Since your app is a watchOS app, I'm not sure that you'll have the same result, but it's worth a try.