How to fix Xcode "DTAssetProviderService could not start.." error?
If you want the slow solution, you can reinstall Xcode 7.3.1 by downloading it from https://developer.apple.com/download/more/.
It worked for me and now my Simulator is able to start again without getting the error.
The issue is discussed in depth here: How to fix Xcode "DTAssetProviderService could not start.." error?
This seems to be a major bug. Until Apple fixes it, you can work around it:
- Build app
- The app will still install on the simulator, even with the error
- Launch the app manually on the simulator
- Go to Xcode
- Click Debug > Attach to Process > Your App Name
That will enable Xcode debugging features and allow your app to run in simulator. Definitely not ideal, but hopefully you can use this until a real solution comes out.