Kaltura_Client_Exception thrown

Invalid KS "MzZmYmMwOTA2NjIwYjYxODg3YmE1MjY4NDY0NzhkOWI3MmY4MWMyYnwxMDE7OzE0OTg2NTQxMDc7MjsxNDk4NTY3NzA3LjQ4NztBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"