angularjs - yeoman and angular on digitalocean doesn't work -

I try to run angular part with Yemen on digitalocean but I get an error

< Img src = "https: //i.stack.imgur.com/nlXj1.png" alt = "male error">

While trying to use the Keystone Generator, I ran on this issue

I was a new user (I was logged in as a root user through a cloud 9 workspace Was) with root privileges and then Number solved this problem by running yo as a new user.