Kaltura_Client_Exception thrown

Invalid KS "MTI5ZjgzOWUzNjlhMWJlMmE2MDUwZWU4NTBjNjg2NDg3NjAxOWEyZHwxMDE7OzE0OTg3NDQ5MDE7MjsxNDk4NjU4NTAxLjA3MjtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"