TypeError: Cannot read property 'mat' of undefined

[Beefy_carrot]

Hi! im very new to qusar, im trying to use a zip file i downloaded from a udemy course. I unzipped the file to a folder named original in the directory C:\Users\henri. first thing i do is the command: cd original, npm install and then qusar dev. i get this message:

app:quasar-conf Reading quasar.conf.js +0ms
[ TypeError: Cannot read property ‘mat’ of undefined

• quasar.conf.js:12 QuasarConfig.module.exports [as quasarConfigFunction]
  C:/Users/henri/original/quasar.conf.js:12:17

• quasar-config.js:218 QuasarConfig.prepare
  [henri]/[@quasar]/app/lib/quasar-config.js:218:13

• quasar-dev:217 goLive
  [henri]/[@quasar]/app/bin/quasar-dev:217:24

• task_queues.js:97 processTicksAndRejections
  internal/process/task_queues.js:97:5

]
app:dev ️ [FAIL] quasar.conf.js has JS errors +13ms

does anyone know why ?

[Beefy_carrot]

Btw when i run npm audit fix, it dosent solve the problem.

fixed 882 of 891 vulnerabilities in 15548 scanned packages
9 vulnerabilities required manual review and could not be updated