getting a stream to work with AVAudioPlayer - ios

Question

I cannot seem to get this link:
https://api.soundcloud.com/tracks/54507667/stream
to work with the AVAudioPlayer. I have tested it in a Souncloud API started project and it seems to work just fine, however, when I try to implement it on my own it doesn't seem to work.
The error I get:
unrecognized selector sent to instance 0x9245d40
2013-01-04 17:56:04.699 CollectionViewTest[17023:c07] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString absoluteURL]: unrecognized selector sent to instance 0x9245d40'
* First throw call stack:.....
The code:
NSURL *streamURL = [NSString stringWithFormat:#"%#",
allDataDictionarySound[#"stream_url"], nil];
NSLog(streamURL);
NSURLRequest *request = [NSURLRequest requestWithURL:streamURL];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
connectionPlay = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSLog(#"test:");
NSError *playerError;
player = [[AVAudioPlayer alloc] initWithData:streamData error:&playerError];
NSLog(#"test:2");
The streamURL prints as expected, and then the program crashes.
the tests are not printed.
When everything else is commented out, and the NSURLRequest is left, it still crashes.
When I comment the whole block of code out, everything compiles and runs.
I now have attempted this:
NSData *_objectData = [NSData dataWithContentsOfURL:streamURL];
NSError *error;
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:_objectData error:&error];
audioPlayer.numberOfLoops = 0;
audioPlayer.volume = 1.0f;
[audioPlayer prepareToPlay];
if (audioPlayer == nil)
NSLog(#"%#", [error description]);
else
[audioPlayer play];
This also returns the length error, I am at a loss on what could be causing this...
2013-01-05 13:46:16.536 CollectionViewTest[28224:c07] -[NSURL length]: unrecognized selector sent to instance 0x928a470
2013-01-05 13:46:16.546 CollectionViewTest[28224:c07] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURL length]: unrecognized selector sent to instance 0x928a470'
* First throw call stack:

Answer 1

streamURL is an NSString - not a NSURL
try:
NSURL *streamURL = [NSURL URLWithString: [NSString stringWithFormat:#"%#",
allDataDictionarySound[#"stream_url"], nil]];
I'm also not clear where the variable "streamData" is coming from (or what you expect to be in it).
The NSURLConnection is loading the data from the request asynchronously. It looks like you are assuming that the data is loaded synchronously and is available when you're initializing the "player" object. The data will (mostly likely) not be there when player is initialized.