Kaltura_Client_Exception thrown

Invalid KS "YTQyMzA1M2ZkYWY4ODVjZTMzNTA0MjY0YjFlZGY5YjMwMWEzZjUxNXwxMDE7OzE0NjcxMzk4MjQ7MjsxNDY3MDUzNDI0LjcwMDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"