Problem with XCode

Question

I am trying to make an app that makes music once pressed. There are several problems.
This is the code:
#import "ViewController.h"
@implementation ViewController     <--- Incomplete implementation
-(IBAction)idcays; {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFBundleRef soundFileURLRef;
    soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"idcays", CFSTR ("MP4"), NULL);     <--- Incompatible pointer types assigning to 'CFBundleRef' (aka 'struct_CFBundle *) from 'CFURLRef' (aka 'const struct_CFURL*)
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);  <-- Incompatible pointer types passing 'CFBundleRef' (aka 'struct_CFBundle *) to a parameter of type 'CFURLRef' (aka 'const struct_CFURL*)
    AudioServicesPlaySystemSound(soundID);
Any suggestions?

Answer 1

"Incomplete implementation" means your class has either declared methods in the interface that do not exist in the implementation, or the interface supports a protocol containing required methods that do not exist in the implementation.  To find which method is the offender, look at the Issue Navigator and expand the warning.
The "incompatible pointer types passing CFBundleRef" is because CFBundleCopyResourceURL returns a CFURLRef, but you are assigning it to a CFBundleRef.  Should be:
    CFURLRef soundFileURLRef;