Kaltura_Client_Exception thrown

Invalid KS "OGU0ODIyMmE1MjhiNjQ3MGQ3MzhlNWQzNzRjNjRlMjllMDM1Nzg5NXwxMDE7OzE0OTU4ODQxODE7MjsxNDk1Nzk3NzgxLjI5Njk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"