failed to send the qLaunchSuccess packet

Question

I am using XCode 4.3.2 and trying to open an already existing project based on the Facebook SDK sample Project for XCODE and run it on a target IPhone with IOS 4.2. Although it runs on the simulator it crashes on the IPhone printing this error on the console:

failed to send the qLaunchSuccess packet

I really do not know what could be the problem

Answer 1

This happened to me when I accidentally tried to do a device debug using a distribution profile. As soon as I noticed and switched it to a dev profile, the issue went away.

Answer 2

You might have some broken privileges or a hung debugger process (one that didn't quite exit fast enough). Restart Xcode or restart your phone, either way, it's not as bad as it's more annoying cousin, Processes That Can't Be Registered To The BootStrap Server

If all else fails, restore it from a backup.