Kaltura_Client_Exception thrown

Invalid KS "YjIyYWUyY2E2MzdiYzJhZjczOTk5NGNhNjEyYzQ0NTFlNzA0YzhhN3wxMDE7OzE0NzUyMDc2MjI7MjsxNDc1MTIxMjIyLjg0MzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"