Error: spawn php artisa vue-i18n:generate ENOENT when trying to make gulp

Actually I'm trying to compile one gulpfile, when I make

gulp --gulpfile gulpfile.js

this error appears:

[17:42:15] Using gulpfile ~/Escritorio/Projectstoshow/test/test/gulpfile.js
[17:42:15] Starting 'all'...
[17:42:15] Starting 'task'...
[17:42:15] Starting 'js-langs'...
[17:42:15] Finished 'task' after 38 ms
[17:42:15] Starting 'webpack'...
events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: spawn php artisan vue-i18n:generate ENOENT
    at exports._errnoException (util.js:870:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:178:32)
    at onErrorNT (internal/child_process.js:344:16)
    at nextTickCallbackWith2Args (node.js:441:9)
    at process._tickCallback (node.js:355:17)
    at Function.Module.runMain (module.js:444:11)
    at startup (node.js:136:18)
    at node.js:966:3

I installed the vue with this command

npm install vue-i18n --save

And this is my gulpfile (the task called js-langs it's the problem)

const elixir = require('laravel-elixir');
var argv = require('yargs').argv;
var shell = require('gulp-shell');
require('laravel-elixir-vue-2');
elixir(function(mix) {

    mix.task('js-langs', ['resources/lang/**/*.php']);

    //VENDOR CSS
    var vendorcss = [
        '../../../node_modules/flexslider/flexslider.css',
        '../../../node_modules/animate.css/animate.css',
    ];

    var vendorjs = [

    ];

    if (argv.production !== undefined) {
        vendorjs.push('lib/production.js');
    }
    mix.webpack('app.js', 'public/assets/js/app.js')
    mix.styles(vendorcss, 'public/assets/css/vendor.css');
    mix.sass(['../../../public/assets/css/vendor.css', 'resources/assets/sass/app.scss'], 'public/assets/css');

    mix.webpack(vendorjs, 'public/assets/js/vendor.js');

    if (!argv.production && !argv.devel) {
        mix.browserSync({
            proxy: 'testing.loc',
            open: false,
            reloadDebounce: 1000,
            files: [
                //'app/**/*.php',
                'public/assets/css/**/*.css',
                'public/assets/js/**/*.js',
                'public/assets/js/**/*.vue',
                'resources/views/**/*.php'
            ]
        })
    }
})

gulp.task('js-langs', shell.task([
    "php artisan vue-i18n:generate",
]));

If I make the command on shell works, what's wrong? Thanks!