Vue project startup error: cannot find module XXX

Cause: a module that the project depends on cannot be found

Solution:
1. delete the folder where modules are stored node_ module；

2. Execute the clear cache command NPM cache clean
If an error is reported, use to force to clear NPM cache clean -- force
If an error is reported, delete the package-lock.json file;

3. Reinstall the module, NPM install ; (the package-lock.json file will be automatically regenerated)

Then restart NPM run dev.