Fatal error: Call to a member function getQuote() on a non-object

After the last WP update, I received this error:
The configuration with processor is invalid. Call Merchant Service Provider.

After a week, then this began coming up:
Fatal error: Call to a member function getQuote() on a non-object in/homepages/42/d382434107/htdocs/wp-content/plugins/wp-e-commerce/wpsc-includes/cart.class.php on line 818

I did the 4.0 update today, and now no errors show up, and all checkout forms for name, addy, card, etc are gone.

Site is http://www.dittodude.com

Please advise.
Thank you,
Julia

https://wordpress.org/plugins/wp-e-commerce/


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