build - Failed to Attach to Process ID Xcode

Question

Anyone has experienced this problem? Yesterday I still can run my app in simulator but now I cannot run my app since Xcode prints this error in console:

error: failed to attach to process ID <ID number>

I have tried to reinstall, do this post and create new project but returns no luck. Anyone can resolve this issue?

I use Xcode 4.5 Preview 2 and try to run iOS simulator 6

Answer 1

Resetting the content and settings in the simulator worked for me. This is available in the "iOS Simulator" menu.