When I create a new project using the \"Messages Application\" template of Xcode 8 and try to run it on iOS simulator, I get the following error:
I met the same problem,then i fixed it by two steps:
click the New Scheme, add a new scheme.
New Scheme
click the Manage Schemes, and delete the old.
Manage Schemes
then (Although I don't know why) I can run my project!