Kaltura_Client_Exception thrown

Invalid KS "MmNiODU4MTM2ZGExYTU2MzEyMzNmY2QzYWU5NjAzMzk1ZWY0ZGUxZXwxMDE7OzE0NzUwMjI3NjU7MjsxNDc0OTM2MzY1LjU0ODtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"