This is old thread but with still actual problem. If anybody have this type of error with old lenses, please see http://www.butterflybikers.cz/index.php/cz/elektronika/item/1-canon-eos-protocol-convertor-for-old-sigma-lens for ERROR 01 solution for old lenses which don't understand aperture command.
EDIT: link corrected, thanks to dreadylocks for notice.
EDIT: link corrected, thanks to dreadylocks for notice.