Kaltura_Client_Exception thrown

Invalid KS "YmY5ZmQ2ZTk2NWNlN2IxMjIyOGYwZWMxNDg2ZGMyNDY2ZjdjYmFjYXwxMDE7OzE0NzUzNDc3NDc7MjsxNDc1MjYxMzQ3LjA3ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"