Just updated to Xcode 5 and this is the first error its throwing on the logger for all my apps. Can\'t seem to understand why this is happening.
2013-09-
For me it was Keyboard Maestro, adding the simulator to Maestro's exclude list silenced the warnings
I had this problem, and none of the answers in this thread could fix it. Mine was simple UI with a UIDatePicker. I resolved it by removing the UIDatePicker and the associated code, then added them in again. Problem solved!
Final Edit-
Temporary workaround: click iOS Simulator > Reset Content and Settings... and run again.
This error message may reappear at random. For me, it happens when I launch a different application. There are several threads in Apple dev forums and in StackOverflow about this problem, but none have a definitive answer. This seems to be a SDK error to be fixed in the next Xcode version.
Updated: October 3.
CREDIT - Please check this answer - Xcode 5 Error CertUIFramework.axbundle
Further Edit
Although this was potentially the issue resolution at the time. I believe some of the newer answers below relating to the better touch tool are in fact the correct resolutions.
After reading Kirill's answer I did some digging as I didn't want to disable BetterTouchTool for everything just the "iOS Simulator" and you can. Open the "iOS Simulator" and will it as the active app go to the BTT drop-down menu from the top bar (of that screen if you have more than one) and select "Disable BTT for Current App". It will turn to a play icon when it's disabled. Make sure the app name on the bar is still "iOS Simulator" as mine jumped to "Finder" a few times when I clicked the top bar!
Now re-set the simulator (if it doesn't work) and rebuild. You shouldn't get the error! :) Don't forget to clear the error if it's still there. ;)
BTT seems to remember what apps it's disabled for (or at least it does when you close and re-open the app that's disabled I haven't tried a system re-boot yet).
Disk Utility
and apply Repair Disk Permissions
in Macintosh HD.Reset Contents and Settings
in iOS Simulator.This above solution can definitely fix your problem.
I'm on Mavericks (10.9.3) and encountered the same error in xCode(5.1.1).
I tried anything - reinstalling xCode from both AppStore and dmg. Resetting the emulator resulted in the same error and deleting the Simulator SDK folder gave no results too.
The issue on my end was indeed Moom as mentioned by @aorcsik! Disabling it's accessibility, followed by clean (cmd+shift+k) in xCode cleared the error.