Error when starting gulp?

Question

Node.js

Throws an error when starting the gallp. Here is package.json

package.json

{
"name": "website",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"browser-sync": "^2.26.3",
"del": "^3.0.0",
"gulp": "^3.9.1",
"gulp-autoprefixer": "^6.0.0",
"gulp-concat": "^2.6.1",
"gulp-cssmin": "^0.2.0",
"gulp-html-replace": "^1.6.2",
"gulp-rename": "^1.2.2",
"gulp-sass": "^3.0.0",
"gulp-sourcemaps": "^2.6.4",
"gulp-uglify": "^3.0.0"
},
"dependencies": {
"inputmask": "^5.0.3"
}
}

gulpfile

"use strict";

var gulp = require('gulp'),
concat = require('gulp-concat'),
uglify = require('gulp-uglify'),
rename = require('gulp-rename'),
sass = require('gulp-sass'),
maps = require('gulp-sourcemaps'),
del = require('del'),
autoprefixer = require('gulp-autoprefixer'),
browserSync = require('browser-sync').create(),
htmlreplace = require('gulp-html-replace'),
cssmin = require('gulp-cssmin');

gulp.task("concatScripts", function() {
return gulp.src([
'assets/js/vendor/jquery-3.3.1.slim.min.js',
'assets/js/vendor/popper.min.js',
'assets/js/vendor/bootstrap.min.js',
'node_modules/inputmask/dist/jquery.inputmask.js',
'assets/js/vendor/slick/slick.min.js',
'assets/js/functions.js'
])
.pipe(maps.init())
.pipe(concat('main.js'))
.pipe(maps.write('./'))
.pipe(gulp.dest('assets/js'))
.pipe(browserSync.stream());
});

gulp.task("minifyScripts", ["concatScripts"], function() {
return gulp.src("assets/js/main.js")
.pipe(uglify())
.pipe(rename('main.min.js'))
.pipe(gulp.dest('dist/assets/js'));
});

gulp.task('compileSass', function() {
return gulp.src("assets/css/main.scss")
.pipe(maps.init())
.pipe(sass().on('error', sass.logError))
.pipe(autoprefixer())
.pipe(maps.write('./'))
.pipe(gulp.dest('assets/css'))
.pipe(browserSync.stream());
});

gulp.task("minifyCss", ["compileSass"], function() {
return gulp.src("assets/css/main.css")
.pipe(cssmin())
.pipe(rename('main.min.css'))
.pipe(gulp.dest('dist/assets/css'));
});

gulp.task('watchFiles', function() {
gulp.watch('assets/css/**/*.scss', ['compileSass']);
gulp.watch('assets/js/*.js', ['concatScripts']);
})

gulp.task('clean', function() {
del(['dist', 'assets/css/main.css*', 'assets/js/main*.js*']);
});

gulp.task('renameSources', function() {
return gulp.src(['*.html', '**/*.php', '!dist', '!dist/**'])
.pipe(htmlreplace({
'js': 'assets/js/main.min.js',
'css': 'assets/css/main.min.css'
}))
.pipe(gulp.dest('dist/'));
});

gulp.task("build", ['minifyScripts', 'minifyCss'], function() {
return gulp.src([
'*.html',
'*.php',
'favicon.ico',
"assets/img/**"
], { base: './'})
.pipe(gulp.dest('dist'));
});

gulp.task('serve', ['watchFiles'], function(){
browserSync.init({
server: "./"
});

gulp.watch("assets/css/**/*.scss", ['watchFiles']);
gulp.watch(['*.html', '*.php']).on('change', browserSync.reload);
});

gulp.task("default", ["clean", 'build'], function() {
gulp.start('renameSources');
});

bug

Node version v10.20.1
Npm version 6.14.4

Gulp version:
CLI version: 2.2.0
Local version: 3.9.1