Сборка Gulp

Почему в браузере выдаёт ошибку Cannot GET / ?

let fileinclude = require('gulp-file-include');

let project_folder = "dist";
let source_folder = "src";

let path = {
build: {
html: project_folder + "/",
css: project_folder + "/css/",
js: project_folder + "/js/",
img: project_folder + "/img/",
fonts: project_folder + "/fonts/",
},
src: {
html: source_folder + "/.html",
css: source_folder + "/scss/style.scss",
js: source_folder + "/js/script.js",
img: source_folder + "/img//.{jpg,png,svg,gif,ico,webp}",
fonts: source_folder + "/fonts/.ttf",
},
watch: {
html: source_folder + "//.html",
css: source_folder + "/scss//.scss",
js: source_folder + "/js//.js",
img: source_folder + "/img/*/.{jpg,png,svg,gif,ico,webp}",
},
clean: "./" + project_folder + "/"
}

let { src, dest } = require('gulp'),
gulp = require('gulp'),
browsersync = require("browser-sync").create();
fileinclude = require("gulp-file-include");

function browserSync(params) {
browsersync.init({
server: {
baseDir: "./" + project_folder + "/"
},
port: 3000,
notify: false
})
}

function html() {
return src(path.src.html)
.pipe(fileinclude())
.pipe(dest(path.build.html))
.pipe(browsersync.stream())
}

function watchFiles(params) {
gulp.watch([path.watch.html], html);
}

let build = gulp.series(html);
let watch = gulp.parallel(build, watchFiles, browserSync);

exports.html = html;
exports.build = build;
exports.watch = watch;
exports.default = watch;