IOS swift creating app folder error

I got problem with creating folder for PhotoLibrary. Does anyone know what is wrong there?

            var albumPlaceholder:PHObjectPlaceholder!
            //create the folder
            NSLog("\nFolder \"%@\" does not exist\nCreating now...", albumName)
            PHPhotoLibrary.sharedPhotoLibrary().performChanges({
                let request = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle(albumName)
                albumPlaceholder = request.placeholderForCreatedAssetCollection
                },
                completionHandler: {(success:Bool, error:NSError!)in
                    NSLog("Creation of folder -> %@", (success ? "Success":"Error!"))
                    self.albumFound = (success ? true:false)
                    if(success){
                        let collection = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([albumPlaceholder.localIdentifier], options: nil)
                        self.assetCollection = collection?.firstObject as PHAssetCollection
                    }
            })

This code all the time prints Error! on console. Thanks in advance!