Error message in checkout

This message is shown in checkout. I just upgraded to the OC version 1.5.6.1 and tried to upgrade all the extensions too. Is there still something I need to upgrade, or why this message is there - and how I can fix it?

Notice: Undefined index: payment_company_id in /home/mediteek/public_html/vqmod/vqcache/vq2-catalog_model_checkout_order.php on line 4Notice: Undefined index: payment_tax_id in /home/mediteek/public_html/vqmod/vqcache/vq2-catalog_model_checkout_order.php on line 4

Having made changes you might first flush /vqmod/mods.cache and /vqmod/vqcache/.