I received the same error within the last hour of this post. I contacted my host and had them restore the site. I then updated plugins one by one – “Woocommerce Admin” turned out to be the plugin tossing the error for me. I had the site restored a second time and then “deactivated” and “deleted” the plugin. You should also be able to do this from with in the “plugins” folder on your site.
I’ve deleted the “Woocommerce Admin” plugin from every one of my sites and updated without issue. YMMV – best of wishes and hope you are able to get your site back up.
