Error in gulp when restarting, why?

Question

JavaScript

I start building another site, create all the folders as usual, connect gulp, everything is fine, but when I run gulp again after an hour, I get the following error: The following tasks did not complete: watch, server, styles, scripts, html
Did you forget to signal async completion?
(the project has already tried to rebuild, it did not help)
Code in gulp:

const gulp        = require('gulp');
const browserSync = require('browser-sync');
const sass        = require('gulp-sass');
const cleanCSS = require('gulp-clean-css');
const autoprefixer = require('gulp-autoprefixer');
const rename = require("gulp-rename");
const imagemin = require('gulp-imagemin');
const htmlmin = require('gulp-htmlmin');

gulp.task('server', function() {

    browserSync({
        server: {
            baseDir: "dist"
        }
    });

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

gulp.task('styles', function() {
    return gulp.src("src/sass/**/*.+(scss|sass)")
        .pipe(sass({outputStyle: 'compressed'}).on('error', sass.logError))
        .pipe(rename({suffix: '.min', prefix: ''}))
        .pipe(autoprefixer())
        .pipe(cleanCSS({compatibility: 'ie8'}))
        .pipe(gulp.dest("dist/css"))
        .pipe(browserSync.stream());
});

gulp.task('watch', function() {
    gulp.watch("src/sass/**/*.+(scss|sass|css)", gulp.parallel('styles'));
    gulp.watch("src/*.html").on('change', gulp.parallel('html'));
});

gulp.task('html', function(){
    return gulp.src("src/*.html")
        .pipe(htmlmin({ collapseWhitespace: true }))
        .pipe(gulp.dest('dist/'));
});

gulp.task('scripts', function(){
    return gulp.src("src/js/**/*.js")
        .pipe(gulp.dest('dist/js'));
});

gulp.task('icons', function(){
    return gulp.src("src/icons/**/*")
        .pipe(gulp.dest('dist/icons'));
});

gulp.task('images', function(){
    return gulp.src("src/img/**/*")
        .pipe(imagemin())
        .pipe(gulp.dest('dist/img'));
});



gulp.task('default', gulp.parallel('watch', 'server', 'styles', 'scripts', 'icons', 'html', 'images'));

Answer 1

const gulp = require('gulp');
const browserSync = require('browser-sync').create();
const sass = require('gulp-sass');
const cleanCSS = require('gulp-clean-css');
const autoprefixer = require('gulp-autoprefixer');
const rename = require("gulp-rename");
const imagemin = require('gulp-imagemin');
const htmlmin = require('gulp-htmlmin');

gulp.task('server', function() {
    browserSync.init({
        server: {
            baseDir: "./dist/"
        }
    });
    browserSync.watch("./dist/**/*.*").on('change', browserSync.reload);
});

gulp.task('styles', function() {
    return gulp.src("src/sass/**/*.+(scss|sass)")
        .pipe(sass({ outputStyle: 'compressed' }).on('error', sass.logError))
        .pipe(rename({ suffix: '.min', prefix: '' }))
        .pipe(autoprefixer())
        .pipe(cleanCSS({ compatibility: 'ie8' }))
        .pipe(gulp.dest("dist/css"));
});

gulp.task('html', function() {
    return gulp.src("src/*.html")
        .pipe(htmlmin({ collapseWhitespace: true }))
        .pipe(gulp.dest('dist/'));
});

gulp.task('scripts', function() {
    return gulp.src("src/js/**/*.js")
        .pipe(gulp.dest('dist/js'));
});

gulp.task('icons', function() {
    return gulp.src("src/icons/**/*")
        .pipe(gulp.dest('dist/icons'));
});

gulp.task('images', function() {
    return gulp.src("src/img/**/*")
        .pipe(imagemin())
        .pipe(gulp.dest('dist/img'));
});

gulp.task('watch', function() {
    gulp.watch("src/sass/**/*.+(scss|sass|css)", gulp.series('styles'));
    gulp.watch("src/*.html", gulp.series('html'));
});

gulp.task('default', gulp.series('styles', 'scripts', 'icons', 'html', 'images', gulp.parallel('watch', 'server')));