bootstrap error ios simulator

I tried to laun开发者_运维技巧ch my project, but i got this error while compiling it on the simulator.WorkOut is the name of my project.

Couldn't register com.AE557593PG.WorkOut with the bootstrap server. Error: unknown error code.

---

Try making sure the app isn't running on the simulator already. Worst case scenario, quit and restart both Simulator and Xcode. That's always fixed this for me.