Module build failed: Error: Cannot find module 'node-sass'

There are two things you can do to fixed this issue.

1) npm rebuild node-sass --force 

2) npm install node-sass

This both command will fixed your node-sass issue.

I got the same error and this command fix my issue. sudo npm install --save-dev --unsafe-perm node-sass

This is a common issue

Step 1 : Try removing the node_modules directory

Step 2: Install with the command

npm i