Kaltura_Client_Exception thrown

Invalid KS "ZmFmYjc0YzRlMDMwNmU1MGJiYzc5MjE5NzBhMmMyMjMwNzQ4N2ViOHwxMDE7OzE0OTA2NDk3NjE7MjsxNDkwNTYzMzYxLjA2NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"