Como puedo solucionar el siguiente error:? <code>&lt;$ ng serve -o Could not find module "@angular-devkit/build-angular" from "R:\\Angula...

Como puedo solucionar el siguiente error:?

<$ ng serve -o
Could not find module "@angular-devkit/build-angular" from "R:\\Angular\\Platzi\\platzinger".
Error: Could not find module "@angular-devkit/build-angular" from "R:\\Angular\\Platzi\\platzinger".
    at Object.resolve (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\node\resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\src\architect.js:132:40)
    at Observable._trySubscribe (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:44:25)
    at Observable.subscribe (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:30:22)
    at C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:99:19
    at new Promise (<anonymous>)
    at Observable.toPromise (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:97:16)
    at ServeCommand.initialize (C:\Users\Raul\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js:91:94)
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:11)>