Simulator session timed out when ran `ionic emulate ios`

my solution is based on the same observation of ability to run the app in XCode…
there is some serious issue regarding permissions of project files or the path to the *.app is set wrongly in ‘emulate’ command, so actually what happens, the simulator is not getting correct file, and by trying to open it, it waits and waits till it timeout. That’s just my assumption.