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I’m running an iOS program in the 4.3.2, 5.0, and 5.1 Simulators, and I’m hitting a weird internal exception in AudioToolbox. I have a breakpoint set in Xcode (Xcode 4.3.1, running on 10.7.3) for all exceptions, and the debugger is breaking during a call to AudioServicesCreateSystemSoundID() : SystemSoundID soundID; OSStatus errorCode = AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID); // ^ boom. ^ The backtrace: (lldb) bt * thread #1: tid = 0x1f03, 0x9000e230 libc++abi.dylib`__cxa_throw, stop reason = breakpoint 1.2 frame #0: 0x9000e230 libc++abi.dylib`__cxa_throw frame #1: 0x00144193 AudioToolbox`ID3ParserHandle::ID3ParserHandle(void*, long (*)(void*, unsigned long, unsigned long, unsigned long, void**, unsigned long*)) + 259 frame #2: 0x001442de AudioToolbox`ID3ParserOpen + 62 frame #3: 0x0006c0e7 AudioToolbox`MPEGAudioFile::ParseID3Tags() + 87 frame #4: 0x0006c2ba AudioToolbox`MPEGAudioFile::ParseAudioFile() + 26 frame #5: 0x00015153 AudioToolbox`AudioFileOpenWithCallbacks + 371 frame #6: 0x00027020 AudioToolbox`_ZL15VerifyAndMapURLPK7__CFURLRx + 448 frame #7: 0x00026d85 AudioToolbox`_ZL18ActionDataToServerPK7__CFURLm + 933 frame #8: 0x000da26b AudioToolbox`AudioServicesCreateSystemSoundID + 235 frame #9: 0x00005be1 app`-[SoundsViewController playSoundForPath:] + 257 at SoundsViewController.m:161 frame #10: 0x00005a99 app`-[SoundsViewController tableView:didSelectRowAtIndexPath:] + 777 at SoundsViewController.m:129 frame #11: 0x0029db68 UIKit`-[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140 frame #12: 0x00293b05 UIKit`-[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 219 frame #13: 0x009ad79e Foundation`__NSFireDelayedPerform + 441 frame #14: 0x00fb58c3 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19 frame #15: 0x00fb6e74 CoreFoundation`__CFRunLoopDoTimer + 1220 frame #16: 0x00f132c9 CoreFoun

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