Kaltura_Client_Exception thrown

Invalid KS "YzZlNjIwNmE5MmQxMDQ4NGUyZTU4Y2JmNmVkM2ZkMzVlOWQzNDAwNHwxMDE7OzE0OTg3MDIzMzA7MjsxNDk4NjE1OTMwLjM5NjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"