Kaltura_Client_Exception thrown

Invalid KS "MzUxY2U1NzA5M2ZjYTljYzZlMjA5ODA3ODhlNWExZWQ2NWVlYTgwOXwxMDE7OzE0OTU5NDU5MzY7MjsxNDk1ODU5NTM2LjczMztBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"