Kaltura_Client_Exception thrown

Invalid KS "N2JkNTMwYzAzMTVhMmUxMzk5M2ZlNzJjYzU3M2Q4ZDE0ZGQ5YzhlZnwxMDE7OzE0NzU0NDkwOTA7MjsxNDc1MzYyNjkwLjc0NTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"