Website not showing up: 500 error?

My website has stopped working. Nothing shows up on screen. I initially got an error 500. I see everything on my local.
I talked to my webhost (dreamhost). This is the error they see:

PHP Fatal error: require(): Failed opening required
(include_path=’.:’) in
/home/cqsmunt/ on line 66

I don’t get any similar error when I run it in Debug. But when I roll back some commits (including an update to 3.2) I do get it:

Failed opening required ‘/Users/sarah/Sites/cq/vendor/composer/…/…/kirby/config/setup.php’ (include_path=’.:/usr/local/Cellar/valet-php@7.1/7.1.25/share/valet-php@7.1/pear’)

The former config/aliases.php (up to 3.1.4) was renamed config/setup.php in 3.2.0. Maybe there’s a caching issue or something not correct in your composer setup.

That was it. A cache problem with that file. Thank you!!