The picker view show but immediately close with error

[elahekhani]

hello
I am using your library in my swift project.
my code is:

    **attachmentPickerController.mediaType = [ DBAttachmentMediaType.image , DBAttachmentMediaType.video]
    attachmentPickerController.capturedVideoQulity = UIImagePickerControllerQualityType.typeHigh
    attachmentPickerController.allowsMultipleSelection = true
    attachmentPickerController.allowsSelectionFromOtherApps = true        
    attachmentPickerController.present(on: self)**

The picker view show but immediately close with this log:
"Error: Responder must initialize DBAttachmentPickerController through special method attachmentPickerControllerFinishPickingBlock:cancelBlock:"