Sprite image and style does not generated

[hilo2120]

Here is my code:

var nsg = require('node-sprite-generator');
  nsg({
      src: ['images/1.jpg',
        'images/2.jpg',
        'images/3.jpg'
      ],
      spritePath: 'sprite.png',
      stylesheetPath: 'sprite.css',
      stylesheet: 'css'
  }, function (err) {
      console.log('Sprite generated!');
  });

When i run it using node sprite.js It says "Sprite generated!" but nothing happens, there is no sprite.png and no sprite.css! I'm using vscode internal terminal.