AVAudioPlayer keeps crashing at this line? (initializing)

My AVAudioPlayer keeps crashing at the error:nil line:

AVAudioRecorder *tempRecorder = [[AVAudioRecorder alloc]
                                 initWithURL:nil
                                 settings:nil
                                 error:nil];

I tried setting it to a non-nil value, but still, it keeps crashing at that specific line!

Here's the stack trace:

#0  0x00e0ed65 in CFEqual ()
#1  0x00e69e86 in CFArrayGetFirstIndexOfValue ()
#2  0x0158cda8 in AudioFileFormatRegistry::GetTypesForExtension(__CFString const*, unsigned long*, void*) ()
#3  0x0158eb5c in AudioFileGetGlobalInfoSize ()
#4  0x00cc8e6a in -[AVAudioRecorder initWithURL:settings:error:] ()
#5  0x000033f7 in -[RecorderVC resetRecorder] at /Users/Ahmed/Documents/AudioRecorder/AudioRecorder/RecorderVC.m:52
#6  0x000031d3 in -[RecorderVC viewDidLoad] ()
#7  0x000c4089 in -[UIViewController view] ()
#8  0x000d6f54 in -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] ()
#9  0x000d5aaa in -[UITabBarController transitionFromViewController:toViewController:] ()
#10 0x000d78a2 in -[UITabBarController _setSelectedViewController:] ()
#11 0x000d7d5e in -[UITabBarController viewWillLayoutSubviews] ()
#12 0x001e82e9 in -[UILayoutContainerView layoutSubviews] ()
#13 0x017e1a5a in -[CALayer layoutSublayers] ()
#14 0x017e3ddc in CALayerLayoutIfNeeded ()
#15 0x017890b4 in CA::Context::commit_transaction(CA::Transaction*) ()
#16 0x0178a294 in CA::Transaction::com开发者_JAVA百科mit() ()
#17 0x000169c9 in -[UIApplication _reportAppLaunchFinished] ()
#18 0x00016e83 in -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] ()
#19 0x00021617 in -[UIApplication handleEvent:withNewEvent:] ()
#20 0x00019abf in -[UIApplication sendEvent:] ()
#21 0x0001ef2e in _UIApplicationHandleEvent ()
#22 0x01130992 in PurpleEventCallback ()
#23 0x00ed8944 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ ()
#24 0x00e38cf7 in __CFRunLoopDoSource1 ()
#25 0x00e35f83 in __CFRunLoopRun ()
#26 0x00e35840 in CFRunLoopRunSpecific ()
#27 0x00e35761 in CFRunLoopRunInMode ()
#28 0x000167d2 in -[UIApplication _run] ()
#29 0x00022c93 in UIApplicationMain ()
#30 0x00002a39 in main ()

You can't pass nil for initWithURL:. See:

http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVAudioRecorder_ClassReference/Reference/Reference.html