Get metadata in UIImagepickerController swift mode

I am trying to follow the answer in iOS 8 UIImage Metadata for Objective-C in SWIFT as follows

//source: http://stackanswers.com/questions/24227578/ios-8-uiimage-metadata
func metaDataFromAssetLibrary(info: NSDictionary) {

    var assetURL = info.objectForKey(UIImagePickerControllerReferenceURL) as NSURL
    var assetLibrary = ALAssetsLibrary()
    assetLibrary.assetForURL(assetURL as NSURL, resultBlock: {
        (asset: ALAsset!) in
            var metadata: NSDictionary = asset.defaultRepresentation().metadata() as NSDictionary
            NSLog ("imageMetaData from AssetLibrary %@",metadata);

        }, failureBlock: {
            (error: NSError!) in

            NSLog("Error!")
    })

}

      

        
        
        
      

    

I call it with

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!){

    // https://stackoverflow.com/questions/3088874/didfinishpickingmediawithinfo-return-nil-photo
    picker.dismissViewControllerAnimated(true, completion: nil)

    let image = info.objectForKey("UIImagePickerControllerOriginalImage") as UIImage

    PHPhotoLibrary.sharedPhotoLibrary().performChanges({
        let createAssetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage(image)
        let assetPlaceholder = createAssetRequest.placeholderForCreatedAsset
        let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection, assets: self.photosAsset)

        albumChangeRequest.addAssets([assetPlaceholder])
        }, completionHandler: {(success, error)in
            NSLog("Adding Image to Library -> %@", (success ? "Sucess":"Error!"))
            picker.dismissViewControllerAnimated(true, completion: nil)
    })
    metaDataFromAssetLibrary(info)

}

      

        
        
        
      

    

which results in "fatal error: Zero encountered unexpectedly while expanding optional value"