Could not find the implementation for builder @angular-devkit/build-angular:dev-server on ng serve command

Question

I tried to update the angular CLI following this, but now I can't run my app. When I try to run the command ng serve, it gives me this error:

Could not find the implementation for builder @angular-devkit/build-angular:dev-server Error: Could not find the implementation for builder @angular-devkit/build-angular:dev-server     at WorkspaceNodeModulesArchitectHost.resolveBuilder (C:\Users\Lupus\Documents\full-stack-projects\financial-app-ui\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js:49:19)     at ServeCommand.initialize (C:\Users\Lupus\Documents\full-stack-projects\financial-app-ui\node_modules\@angular\cli\models\architect-command.js:135:55)     at process._tickCallback (internal/process/next_tick.js:68:7)     at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)     at startup (internal/bootstrap/node.js:283:19)     at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3) 

I have tried everything I could found.

• I tried to manually install devkit with the command npm install --save-dev @angular-devkit/build-angular
• I tried to run the command npm i --only=dev
• I tried to run the commands

:

npm install ng update npm update 

• Removed the node_modules folder and the package-lock.json file and ran the commands all again.

Nothing worked. Running ng v gives me this:

Angular CLI: 8.0.3 Node: 10.15.0 OS: win32 x64 Angular: 8.0.1 ... animations, cdk, common, compiler, compiler-cli, core, forms ... language-service, platform-browser, platform-browser-dynamic ... router  Package                           Version ----------------------------------------------------------- @angular-devkit/architect         0.13.9 @angular-devkit/build-angular     0.13.9 @angular-devkit/build-optimizer   0.13.9 @angular-devkit/build-webpack     0.13.9 @angular-devkit/core              7.3.9 @angular-devkit/schematics        8.0.3 @angular/cli                      8.0.3 @ngtools/webpack                  7.3.9 @schematics/angular               8.0.3 @schematics/update                0.800.3 rxjs                              6.5.2 typescript                        3.4.5 webpack                           4.29.0 

And my package.json is like this:

{   "name": "financial-app-ui",   "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": "^8.0.1",     "@angular/cdk": "^8.0.1",     "@angular/common": "^8.0.1",     "@angular/compiler": "^8.0.1",     "@angular/core": "^8.0.1",     "@angular/forms": "^8.0.1",     "@angular/platform-browser": "^8.0.1",     "@angular/platform-browser-dynamic": "^8.0.1",     "@angular/router": "^8.0.1",     "core-js": "^2.6.9",     "font-awesome": "^4.7.0",     "primeicons": "^1.0.0",     "primeng": "^7.1.3",     "rxjs": "~6.5.2",     "tslib": "^1.10.0",     "zone.js": "~0.9.1"   },   "devDependencies": {     "@angular-devkit/build-angular": "^0.13.9",     "@angular/cli": "^8.0.3",     "@angular/compiler-cli": "^8.0.1",     "@angular/language-service": "^8.0.1",     "@types/jasmine": "~2.8.8",     "@types/jasminewd2": "~2.0.3",     "@types/node": "~8.9.4",     "codelyzer": "~4.5.0",     "jasmine-core": "~2.99.1",     "jasmine-spec-reporter": "~4.2.1",     "karma": "~4.0.0",     "karma-chrome-launcher": "~2.2.0",     "karma-coverage-istanbul-reporter": "~2.0.1",     "karma-jasmine": "~1.1.2",     "karma-jasmine-html-reporter": "^0.2.2",     "protractor": "~5.4.0",     "ts-node": "~7.0.0",     "tslint": "~5.11.0",     "typescript": "~3.4.5"   } } 

Does anyone have any other suggestion?

Answer 1

I got this working by reinstalling the build-angular package. Note the '--save-dev' flag on the install command:

npm uninstall @angular-devkit/build-angular npm install --save-dev @angular-devkit/build-angular