"ng serve" command shows unhandled exception error

Question

Given below is the error message that I recieve

An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/package.json'
Require stack:
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\index.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\commands\serve-impl.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\export-ref.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\index.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\utilities\json-schema.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\lib\cli\index.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js
- C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng
See "C:\Users\user\AppData\Local\Temp\ng-MDn3so\angular-errors.log" for further details.

What is the reason for this error ?
My angular CLI version is 12 and the angular core version is 10. I tried updating angular core but it is not being updated

Does this answer your question? Could not find module "@angular-devkit/build-angular" — R. Richards
– R. Richards, Commented Sep 6, 2021 at 11:55

Apoorva Chikara · Accepted Answer · 2021-09-06 11:57:03Z

1

A simple fix for this could be these steps.

remove node_modules rm -rf node_modules or just delete them
run npm i or npm i --only=dev(only when all modules are already installed just need to save the dev dependencies)
run ng serve or npm start

If the above steps show same error then you should update your dependencies.

run npm update
run npm i @angular-devkit/build-angular or npm install --save-dev @angular-devkit/build-angular

answered Sep 6, 2021 at 11:57

Apoorva Chikara

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2 Comments

Explorador Over a year ago

it says "rm" is not recognized as an internal or external command, operable program or batch file

Apoorva Chikara Over a year ago

Thats why I added delete them using normally deleting the folder. rm runs when you are on Linux or Unix based system. On windows system, it does work with cmdr too if you have it.

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