Error using AVAudioRecorder - objective-c

Question

I'm making this voice recording app, but for some reason it won't let me use this delete method without crashing:
-(void)deleteCurrentFiles {
if(recorder != nil) {
if([recorder isRecording]) {
[recorder stop];
}
[recorder release];
recorder = nil;
[self performSelector:#selector(resetTotalTimeLabel) withObject:nil afterDelay:1.0];
}
if(player != nil) {
if([player isPlaying]) {
[player stop];
}
[player release];
player = nil;
currentTime = 0;
timeSlider.value = 0;
[self performSelector:#selector(resetCurrentTimeLabel) withObject:nil afterDelay:0.1];
}
if(commentRecorder != nil) {
if([commentRecorder isRecording]) {
[commentRecorder stop];
}
}
}
The declarations of these instances:
AVAudioRecorder *recorder;
AVAudioRecorder *commentRecorder;
AVAudioPlayer *player;
In resetTotalTimeLabel and resetCurrentTimeLabel there is no referance to / usage of the recorders/player.
The error I get is:
-[__NSArrayI finishedRecording]: unrecognized selector sent to instance 0x1b3ba0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI finishedRecording]: unrecognized selector sent to instance 0x1b3ba0'
*** Call stack at first throw:
(
0 CoreFoundation 0x35f08c7b __exceptionPreprocess + 114
1 libobjc.A.dylib 0x30186ee8 objc_exception_throw + 40
2 CoreFoundation 0x35f0a3e3 -[NSObject(NSObject) doesNotRecognizeSelector:] + 98
3 CoreFoundation 0x35eaf467 ___forwarding___ + 506
4 CoreFoundation 0x35eaf220 _CF_forwarding_prep_0 + 48
5 CoreFoundation 0x35ea3f79 -[NSObject(NSObject) performSelector:withObject:] + 24
6 Foundation 0x33fd3e6d __NSThreadPerformPerform + 272
7 CoreFoundation 0x35ebc8d1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
8 CoreFoundation 0x35e8cecd __CFRunLoopDoSources0 + 384
9 CoreFoundation 0x35e8c6f9 __CFRunLoopRun + 264
10 CoreFoundation 0x35e8c50b CFRunLoopRunSpecific + 226
11 CoreFoundation 0x35e8c419 CFRunLoopRunInMode + 60
12 GraphicsServices 0x35261d24 GSEventRunModal + 196
13 UIKit 0x3386557c -[UIApplication _run] + 588
14 UIKit 0x33862558 UIApplicationMain + 972
15 App Name 0x00002959 main + 80
16 App Name 0x00002904 start + 40
)
terminate called after throwing an instance of 'NSException'
It actually seems to happen to the recorder after this method is called.. So is there anything I should add to this method to make it work?
Any thoughts are greatly appriciated!

Answer 1

sending a message to an object which does not respond to it at a strange point in time is a good indication of a reference count imbalance. run your app with zombies enabled in Instruments. reproduce the crash and see if it is a zombie.