Kaltura_Client_Exception thrown

Invalid KS "Mzg1NGU3YmZkYzEzNGVmNzIyMzZmMzU2Y2IyMTEzMTY3MDAyYzdjNHwxMDE7OzE0NzUyMDY0MzA7MjsxNDc1MTIwMDMwLjU1NTtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"