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My gulp clean task throwing me an error


I have a problem when i run the gulp clean task.

treehouse-gulp-basics hugo$ gulp clean
    throw err;

Error: Cannot find module 'gulp-sourcemaps'
    at Function.Module._resolveFilename (module.js:555:15)
    at Function.Module._load (module.js:482:25)
    at Module.require (module.js:604:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/hugo/Desktop/treehouse-gulp-basics/gulpfile.js:8:12)
    at Module._compile (module.js:660:30)
    at Object.Module._extensions..js (module.js:671:10)
    at Module.load (module.js:573:32)
    at tryModuleLoad (module.js:513:12)
    at Function.Module._load (module.js:505:3)

This is what my js file looks like:

"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');

gulp.task("concatScripts", function() {
    return gulp.src([

gulp.task("minifyScripts", ["concatScripts"], function() {
  return gulp.src("js/app.js")

gulp.task('compileSass', function() {
  return gulp.src("scss/application.scss")

gulp.task('watchSass', function() {
  gulp.watch('scss/**/*.scss', ['compileSass']);

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

gulp.task("build", ['minifyScripts', 'compileSass'], function(){
  return gulp.src(["css/application.css", "js/app.min.js", "index.html",
                    "img/**", "fonts/**"],  { base: "./" })

gulp.task("default", ["build"]);

Any ideas of what is wrong?