Can not find module “@angular-devkit/build-angular”

Using npm, I followed the getting started directions on the Angular CLI quick start page.

Angular CLI Quickstart

Running ng serve --open after creating and going into my new project “frontend” gave this error:

Could not find module "@angular-devkit/build-angular" from "C:\\Users\\Brandon\\project-name\\frontend".
Error: Could not find module "@angular-devkit/build-angular" from "C:\\Users\\Brandon\\project-name\\frontend".
 at Object.resolve (C:\Users\Brandon\project-name\node_modules\@angular-devkit\core\node\resolve.js:141:11)
 at Observable.rxjs_1.Observable [as _subscribe] (C:\Users\Brandon\project-name\node_modules\@angular-devkit\architect\src\architect.js:132:40)

I have tried suggestions from the other question similar to mine but it did not work. Answer was to run npm install --save-dev @angular-devkit/build-angular.

Similar Question

I have also deleted modules, cleared cache, then did an install which also did not work.

package.json:

{
 "name": "frontend",
 "version": "0.0.0",
 "scripts": {
   "ng": "ng",
   "start": "ng serve",
   "build": "ng build",
   "test": "ng test",
   "lint": "ng lint",
   "e2e": "ng e2e"
 },
"private": true,
"dependencies": {
  "@angular/animations": "^6.0.2",
  "@angular/common": "^6.0.2",
  "@angular/compiler": "^6.0.2",
  "@angular/core": "^6.0.2",
  "@angular/forms": "^6.0.2",
  "@angular/http": "^6.0.2",
  "@angular/platform-browser": "^6.0.2",
  "@angular/platform-browser-dynamic": "^6.0.2",
  "@angular/router": "^6.0.2",
  "core-js": "^2.5.4",
  "rxjs": "^6.0.0",
  "zone.js": "^0.8.26"
 },
"devDependencies": {
  "@angular/compiler-cli": "^6.0.2",
  "@angular-devkit/build-angular": "~0.6.3",
  "typescript": "~2.7.2",
  "@angular/cli": "^6.0.3",
  "@angular/language-service": "^6.0.2",
  "@types/jasmine": "~2.8.6",
  "@types/jasminewd2": "~2.0.3",
  "@types/node": "~8.9.4",

angular.json:

 {
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "frontend": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {},
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/frontend",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.css"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"