it doesn't start when i send npm express-mvc-generator

[tanosk8]

this is output when i send the command on terminal

npm WARN saveError ENOENT: no such file or directory, open '/Users/xyz/workspace-nodejs/prova/package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open '/Users/gaetano/workspace-nodejs/roveeeeeee/package.json'
npm WARN prova No description
npm WARN prova No repository field.
npm WARN prova No README data
npm WARN prova No license field.

• express-mvc-generator@2.2.4
  added 4 packages from 3 contrib

can u help me?!