Kaltura_Client_Exception thrown

Invalid KS "ZDVlYzFmZGYyYWEzNzgzMjkzY2IzZDQyYjFmMzI2ZWYyYzljYmNkNnwxMDE7OzE0ODE0MTMxNzU7MjsxNDgxMzI2Nzc1LjA0MjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"