Installing Node Dependcies on and Running the vue-app

[Avvyyy]

I don't know if it is just me, but I have tried completing this module with the vue-app and when I run
npm install
It throws errors, sometimes "npm login" errors. When I try npm install, it does not throw that error so I know that it is not a problem from my end. Also, when I run npm run serve, it says that vue-cli-service is not a command identified by node, something along those lines. I am however able to run npm run serve on other vue projects I have on my computer.

Please, are there are suggestions to what I can do? I have unistalled node and vue and installed them again all to no avail.