Xcode can't find headers in given framework

Messing round a little 开发者_JAVA技巧in Xcode, and I was trying to get my app to look at the users music library with the use of MPMediaPickerController.

Following Apples documentation, I added the MediaPlayer.framework to the project, and in my header I've imported , giving me something like this:

#import <GameKit/GameKit.h>
#import <MediaPlayer/MediaPlayer.h>

@interface HelloMusic :  UIViewController
{

} 

So far so simple. Now, as far as I'm aware I should be able to do

MPMediaPickerController *mp = [[MPMediaPickerController alloc] init];

in my main file and set about launching my picker. Unfortunately XCode stubbronly refuses to admit that there is such a thing as an MPMediaPickerController - if I type MP and hit escape to get code complations I am without any of the MPMedia family. Annoyingly Xcode does recognise any MPMovie... class (from the same framework!). If I try and run the app it compiles fine so it must at least recognise the header from the framework, then chunters along until I get to the assignment of MPMediaPickerController, at which point I get an EXC_BAD_ACCESS, with a console output of

Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
pthread_mutexattr_destroy$UNIX2003 called from function _ZN4llvm3sys5MutexC2Eb in image
libLLVMContainer.dylib.

I'm... certain I'm doing something beyond stupid, but I'm stuck nevertheless.

---

As the class reference states, it's declared in MPMediaPickerController.h. As such, simply adding...

#import <MediaPlayer/MPMediaPickerController.h>

...should solve your problems. :-)