Gulp does not build the project, how to solve?

Question

gulp.js

var gulp        =       require('gulp');
var browserSync =       require('browser-sync').create();
var less        =       require('gulp-less');


// TASKS

gulp.task('server', gulp.parallel('less'), function() {
    browserSync.init({
        server: {baseDir: './src/'}
    });

    gulp.watch('src/**/*.html').on('change', browserSync.reload);
    gulp.watch('src/less/**/*.less', gulp.parallel('less'));
    

});

gulp.task('less', function() {
    return gulp.src('./src/less/main.less')
        .pipe(less())
        .pipe(gulp.dest('./src/css'))
        .pipe(browserSync.stream());
});
 
gulp.task('default', gulp.parallel('server'));