[Vuejs]-Vue.js project npm install errors

First I added these two values to ~/.npmrc:

timeout=60000
prefer-offline=true

then I have used the following command with deleting the node_modules folder:

npm  cache clear --force

Then I added .npmignore to the root of my project

After that, I used

npm config set registry http://registry.npmjs.org/

but when I installed it with npm I checked as root like so :

sudo  npm update

and it worked!