Error: Cannot find module './drivers' with mongoose only on the server

Question

mongoose works fine on the computer

but on the server I get this error:

Error: Cannot find module './drivers'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Function.<anonymous> (/usr/local/lib/node_modules/pm2/node_modules/pmx/lib/transaction.js:59:21)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/html/WTV.com/node_modules/mongoose/lib/schema.js:5:16)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)

Answer 1

OK! I took me a while but I found the solution

1. in commandline write: heroku config:set NODE_MODULES_CACHE=false --app
2. make some change and push the project
3. in commandline write: heroku config:set NODE_MODULES_CACHE=true --app

Good luck :)