Kaltura_Client_Exception thrown

Invalid KS "NmExZjI3NmIxYTQxNGJmMTEyYzI1NzM2YmEyZjg3YzZlZDI4MjdjM3wxMDE7OzE1MDA4OTUyODA7MjsxNTAwODA4ODgwLjUxMzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"