Solved.

I think changing the .npm folder permissions made the trick.

sudo chown -R $USER:$GROUP ~/.npm

I deleted the project, changed the permissions and made again the mean init afterwards.

글올린 양키가 sudo chown -R $USER:$GROUP ~/.npm 해서 고쳤다는 내용같은데 이쉑이 맥북쓰는넘임? 윈도우에 sudo가 왜붙어