Hey there Charles!
Thanks for reaching out.
I’m not seeing the error on the domain you have listed in your profile, this makes me think that you may have WP_DEBUG enabled in your wp-config.php
WP_DEBUG is frequently used for troubleshooting. It allows the webmaster to see what errors are coming through.
Go ahead and open up your wp-config.php file and search for a line that contains WP_DEBUG. If the line exists, removing that entire line will stop these developer messages from appearing.
Looking at the error itself, it sounds like your site is making some large database queries. There is a setting that can be changed, but unless you are running a VPS or managing your own server, the ISP will have to increase the SET GLOBAL option.
Hope that helps!