UUID mismatch detected with the loaded library

Uninstalling and reinstalling both the iOS on the device and the SDK did not fix this for me. The only way I was able to get around this issue was by deleting the DeviceSupport files for the 4.2.1 iOS version, which can be found at:

/Developer/Platforms/iPhoneOS.platform/DeviceSupport/

After deleting the files and restarting Xcode, I plugged in my device and was prompted to restore the symbol files from the device itself – it took about 5 minutes and after this, everything was back to working perfectly.

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