Monotouch saving image error

gistfile1.cs

void initCameraView(){
			NSError error = null;
			captureSession = new AVCaptureSession(){
				SessionPreset=AVCaptureSession.Preset640x480
			};
			var device = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Video);
			var deviceInput = AVCaptureDeviceInput.FromDevice(device,out error);
			if(error!=null){
				displayErrorOnMainQueueWithMessage(error,"Unable to setup capture");
				return;
			}
			if(captureSession.CanAddInput(deviceInput)){
				captureSession.AddInput(deviceInput);
			}
			
			//create still image output
			stillImageOutput = new AVCaptureStillImageOutput();
			
			if(captureSession.CanAddOutput(stillImageOutput)){
				captureSession.AddOutput(stillImageOutput);
			}
			previewLayer = new AVCaptureVideoPreviewLayer(captureSession){
				BackgroundColor = UIColor.Black.CGColor,
				VideoGravity = AVPlayerLayer.GravityResizeAspect
			};
			var rootLayer = this.PreviewView.Layer;
			rootLayer.MasksToBounds = true;
			previewLayer.Frame = rootLayer.Bounds;
			rootLayer.AddSublayer(previewLayer);
			
			captureSession.StartRunning();
		}

void TakePhoto(object sender,EventArgs eventArgs){
                      var videoConnection = stillImageOutput.ConnectionFromMediaType(AVMediaType.Video);
			if(videoConnection==null){
				return;
			}
			stillImageOutput.CaptureStillImageAsynchronously(videoConnection,(imageDataSampleBuffer,error)=>{
				
				if(error!=null){
					this.displayErrorOnMainQueueWithMessage(error,"Unable to take photo");
					return;
				}
				
				var jpgData = AVCaptureStillImageOutput.JpegStillToNSData(imageDataSampleBuffer);
				
				var uiImage = UIImage.LoadFromData(jpgData);
				
				ALAssetsLibrary library = new ALAssetsLibrary();
				library.WriteImageToSavedPhotosAlbum(uiImage,(ALAssetOrientation)uiImage.Orientation,(assetUrl,saveerror)=>{
			
					//!!saveerror is set to NSError with "Failed to encode image for saved photos." and error code -3304
					
				});

			
			});
		}