Cocoa: AVFoundation - no active/enabled connections - cocoa

Question

I'm trying to build a simple app that captures video off of the built-in iSight camera of a MacBook. I've looked at a couple of example projects on the developer site and am following the tutorial here: Apple's AVFoundation Guide.
Each time I keep breaking on the AVCaptureMovieFileOutput, I get an uncaught exception - no active/enabled connections. I'm new to AV framework so I'm not sure why it recognizes the iSight, allows me to input it to the session, allows me to make a movie output for the session but then tells me there's no connections? What connections is it looking for? (Note: I do not have a QTMovieView in my viewcontroller yet but thought I would only need that for playback, not recording).
I know the iSight is working as I just used it recently with Skype.
Here's my relevant code:
thisSession = [[AVCaptureSession alloc] init];
//set presets for this session
if ([thisSession canSetSessionPreset:AVCaptureSessionPreset640x480]) {
thisSession.sessionPreset = AVCaptureSessionPreset640x480;
NSLog(#"Session Preset: OK");
//capture a device - captures all the devices, microphone, camera, etc.
NSArray *devices = [AVCaptureDevice devices];
//this will hold our decvice
AVCaptureDevice* iSightCamera;
for (AVCaptureDevice *device in devices) {
//we only want to work with the internal camera
if ([[device localizedName] isEqualToString:#"Built-in iSight"]) {
iSightCamera = device;
//creating an input of the device for the session
NSError *error = nil;
AVCaptureDeviceInput* iSightCameraInput =
[AVCaptureDeviceInput deviceInputWithDevice:iSightCamera error:&error];
if (!iSightCameraInput) {
NSLog(#"Error creating device input: %#", error);
} else {
NSLog(#"iSight device input created!");
//adding the device input to the session
if ([thisSession canAddInput:iSightCameraInput]) {
[thisSession addInput:iSightCameraInput];
NSLog(#"iSight input added to session!");
//add the output to the session
AVCaptureMovieFileOutput *movieOutput = [[AVCaptureMovieFileOutput alloc] init];
if ([thisSession canAddOutput:movieOutput]) {
[thisSession beginConfiguration];
[thisSession addOutput:movieOutput];
[thisSession commitConfiguration];
NSLog(#"Movie output added to the session!");
//start writing the movie
NSURL *movieFolder = [NSURL fileURLWithPath:[#"~/Movies" stringByExpandingTildeInPath]];
[movieOutput startRecordingToOutputFileURL:movieFolder recordingDelegate:self];
}
else {
NSLog(#"Error: Could not add movie output to the session.");
}
}
else {
NSLog(#"Error: Could not add iSight to session.");
}
}
}
}