Что не так с кодом в gulpfile.js?

В проекте был обновлен Gulp до версии 4.0 после чего стала всплывать ошибка(в скриншоте).
Код gulpfile.js:
"use strict";

var gulp = require("gulp");
var sass = require("gulp-sass");
var plumber = require("gulp-plumber");
var postcss = require("gulp-postcss");
var autoprefixer = require("autoprefixer");
var server = require("browser-sync").create();
var minify = require("gulp-csso");
var rename = require("gulp-rename");
var imagemin = require("gulp-imagemin");
var posthtml = require("gulp-posthtml");
var include = require("posthtml-include");
var run = require("run-sequence");
var del = require("del");
var uglify = require("gulp-uglify");

gulp.task("images", function () {
return gulp.src("source/img/**/*.{png,jpg,svg}")
.pipe(imagemin([
imagemin.optipng({optimizationLevel: 3}),
imagemin.jpegtran({progressive: true}),
imagemin.svgo()
]))
.pipe(gulp.dest("build/img"));
});

gulp.task("html", function () {
return gulp.src("source/*.html")
.pipe(posthtml([
include()
]))
.pipe(gulp.dest("build"));
});

gulp.task("copy", function () {
return gulp.src([
"source/fonts/**/*.{woff,woff2}",
"source/img/**",
"source/pic/**",
"source/js/**",
"source/video/**",
"source/vendor/**"
], {
base: "source"
})
.pipe(gulp.dest("build"));
});

gulp.task("clean", function () {
return del("build");
});

gulp.task("style", function() {
gulp.src("source/sass/style.scss")
.pipe(plumber())
.pipe(sass())
.pipe(postcss([
autoprefixer()
]))
.pipe(gulp.dest("build/css"))
.pipe(minify())
.pipe(rename("style.min.css"))
.pipe(gulp.dest("build/css"))
.pipe(server.stream());
});

gulp.task("compress", function() {
return gulp.src("source/js/*.js")
.pipe(uglify())
.pipe(rename({suffix: ".min"}))
.pipe(gulp.dest("build/js"))
});

gulp.task("serve", function(cb) {
server.init({
server: "build/",
notify: false,
open: true,
cors: true,
ui: false,
cb
});

gulp.watch("source/sass/**/*.{scss,sass}", ["style"]);
gulp.watch("source/*.html", ["html"]);
});

gulp.task("build", function (done) {
run(
"clean",
"copy",
"style",
"images",
"html",
"compress",
done
);
});