Kaltura_Client_Exception thrown

Invalid KS "MWRjNTgyZTk3ODBhZTk0Y2EzM2UxNmM2Yzc0YjdhN2ZlYTFhYzAyN3wxMDE7OzE0OTA0MDkyNTE7MjsxNDkwMzIyODUxLjU5ODtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"