Kaltura_Client_Exception thrown

Invalid KS "ZjZjOWVhZDg3NDc3ODRmODg5YTZkNWVlODliMWU0ZTRkNGE3ZThmN3wxMDE7OzE0NzUzODYxNDQ7MjsxNDc1Mjk5NzQ0LjczMzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"