I’ve been getting the same thing all week on my site too. The only way I’ve found to get access to WP admin is to log into my web hosting account, find the WooCommerce plug-in and delete it. That’s not particularly helpful if I want to sell things.
I’ve tried disabling and even deleting all non-essential plug-ins, but the site crashes as soon as I try reinstalling and activating WooCommerce. My next step is to try uninstalling my theme.
If anyone has an answer, I’m all ears.