Gulp doesn't work

[giulialeonardi]

Using the following gulpfile.js file :

var gulp = require('gulp');
gulp.task('default', function () {
console.log('I am about to learn the essentials of React.js');
});

I get the error shown below:

[15:59:40] Using gulpfile ~\source\repos\snapterest\gulpfile.js [15:59:40] Starting 'default'... I am about to learn the essentials of React.js
[15:59:40] The following tasks did not complete: default
[15:59:40] Did you forget to signal async completion?