Logs:
2022-07-14 17:17:46: Error: Error building site: failed to render pages: render of “page” failed: “/jgmac1106_d944ac/layouts/post/single.html:9:5”: execute of template failed: template: post/single.html:9:5: executing “main” at <partial “reply-by-email.html” .>: error calling partial: partial “reply-by-email.html” not found
Regarding theme uninstall, you could just install another theme and that should replace this. This particular error reads as if it is expecting Reply by email plugin to be available. Can you try install the plugin to check if the error goes away?
Now that I think about this, I wonder if I can make that conditional on whether the partial template exists. I’d like to encourage usage of that plugin but not require it of course.