Kaltura_Client_Exception thrown

Invalid KS "YmVhYTNmMzFlNzE5MzJmYmM2NzU5NDQ4MjFiNmE3MzgxMGZlY2NlMXwxMDE7OzE0OTMwODQzNDQ7MjsxNDkyOTk3OTQ0LjA0NDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"