problem setting up website dev environment

hey y'all! I'm trying to run the development environment for the website, and everything looks ok when I install dependencies, but when I run

npm run dev

npm run dev

I get this error message:

Error: Cannot find module 'config/postcss.config

Error: Cannot find module 'config/postcss.config

my fork/branch is up-to-date with the master branch. Anyone know why this is happening?