An unhandled exception occurred: cannot find module '@angular-devkit/build-angular/package.json' require stack:

I have been assigned a task where I have to run ng serve command in folder.

I have installed node.js and checked it's version. Run this command npm install -g @angular/core @angular/cli

I have following folder structure.

ProjectFolder - > ClientApp - >Src
                            -> dist
                            -> e2e

I am running this command inside ProjectFolder and I am getting this error.The serve Command requires to be angular project but project definition could not found.

Is my path is wrong? In which folder shall I run this command ? ClientApp or Src?

If I make new project and serve this ng serve,it is working.

So I tried to run project inside ClientApp

When I am running ng serve inside clientApp,getting msg :An unhandled exception occurred:

Cannot find module

'@angular-devkit/build-angular/package.json' Require stack: .

So many error like AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js

\AppData\Roaming\npm\node_modules\@angular\cli\utilities\json-schema.js

AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js

AppData\Roaming\npm\node_modules\@angular\cli\bin\ng
I have taken my project from live devops directory.

It don't have node_modules folder in project.

Do that folder is necessary?

Do I need run npm install command?

Inside which folder?ClientApp?