Problem with playing a sound file.

Hi,
I simply want to play a sound by a button click. I imported
<AVFoundation/AVAudioPlayer.h>. The code block is here:
In .h file:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVAudioPlayer.h>
@interface PlaySoundViewController : UIViewController <AVAudioPlayerDelegate>
in .m file:
-(IBAction)btnPlay:(id)sender
    //Get the filename of the sound file:
    NSString *path = [[NSBundle mainBundle] pathForResource:@"REC001" ofType:@"MP3"];
    AVAudioPlayer* thePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];//error here as it will compile if I commented it (and two line after) out.
    thePlayer.delegate = self;
    [thePlayer play];
Everything looks fine but it failed when I tried to run it. Looks like it cannot find my sound file "REC001.MP3". I put it in folder ".../PlaySound/Resource Files/SoundFiles/REC001.MP3", and "PlaySound" is my project name. However the path returned is ".../PlaySound/REC001.MP3". I guess this is why it cannot find the object. But it didn't work even I put the sound file under "PlaySound" directly. Anyone has a solution?
Thanks.
Regards,
Taizhi

Hi Mark,
Thanks for the reply. Based on your instruction, I checked and I can see the sound files in Build Phases. The location is ".../PlaySound/SoundFiles/REC001.MP3". I don't know why it ignores folder "Resource Files". I guess that is the way it is as I also can see other images in different folders which are shown properly in the project.
The detailed error message is here:
Ld "/Users/greatzhi2001/Library/Developer/Xcode/DerivedData/PlaySound-anydnuuxbpxz lqfodwbuqqjwjzcd/Build/Products/Debug-iphonesimulator/PlaySound.app/PlaySound" normal i386
    cd "/Users/greatzhi2001/Desktop/iProjects/PlaySound"
    setenv MACOSX_DEPLOYMENT_TARGET 10.6
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr /bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3 .sdk -L/Users/greatzhi2001/Library/Developer/Xcode/DerivedData/PlaySound-anydnuuxbpx zlqfodwbuqqjwjzcd/Build/Products/Debug-iphonesimulator -F/Users/greatzhi2001/Library/Developer/Xcode/DerivedData/PlaySound-anydnuuxbpx zlqfodwbuqqjwjzcd/Build/Products/Debug-iphonesimulator "-F/Users/greatzhi2001/Desktop/iProjects/PlaySound" -filelist "/Users/greatzhi2001/Library/Developer/Xcode/DerivedData/PlaySound-anydnuuxbpxz lqfodwbuqqjwjzcd/Build/Intermediates/PlaySound.build/Debug-iphonesimulator/PlayS ound.build/Objects-normal/i386/PlaySound.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework UIKit -framework Foundation -framework CoreGraphics -o "/Users/greatzhi2001/Library/Developer/Xcode/DerivedData/PlaySound-anydnuuxbpxz lqfodwbuqqjwjzcd/Build/Products/Debug-iphonesimulator/PlaySound.app/PlaySound"
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_AVAudioPlayer", referenced from:
      objc-class-ref in PlaySoundViewController.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
Is the framework AVFoundation I added wrong? Thanks.
Regards,
Taizhi

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