I have upgraded macOS Sierra Developer Preview, but my Xcode 7.3.1 gives below error while try to run my project on simulator. In addition Generic to archie
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?