Xcode 8 Beta (null) was unable to service the request

Question

I have an app that worked fine in the released version of Xcode. I downloaded the beta and after I fixed all the little changes I ran it and it worked. I just came back and

Answer 1

My error was similar, instead of "(null)", the message was: "SpringBoard was unable to service the request"

Restarting the simulator worked for me.