Hi i downloaded the application and i did “ng serve” from visual sudio but i had this error

An unhandled exception occurred: Cannot find module ’@angular-devkit/build-angular/package.json’ Require stack: - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\index.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\commands\serve-impl.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\export-ref.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\index.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\utilities\json-schema.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\lib\cli\index.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js - C:\Users\fuads\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng See “C:\Users\fuads\AppData\Local\Temp\ng-dgW9ch\angular-errors.log” for further details.