We have 2 people that have access to the back end of our site, one of which is me. I am the only one with FTP and Control Panel access.
The other person was going to add some new product yesterday and was met with this error.

I tried disabling the Product Grid extension but that just leads to the Manage Product page showing white where the error was and still not loading product.
I can't think of anything that should have changed unless our server host did an auto-update but I always get emails before that happens in case I don't want the update to happen.
Any thoughts on what could be wrong or what I should be doing next to find the issue.