title: Project 'production' could not be found in workspace, when i build the angular project for production
body: <p>I am new to Angular. I use this command <code>ng build --target=production --base-href /</code>, and here is the error that produces while build angular project for production.</p>
  
  <pre><code>Project 'production' could not be found in workspace.
  Error: Project 'production' could not be found in workspace.
      at Workspace.getProject (/home/linux/Downloads/weather/node_modules/@angular-devkit/core/src/workspace/workspace.js:83:19)
      at Architect.getBuilderConfiguration (/home/linux/Downloads/weather/node_modules/@angular-devkit/architect/src/architect.js:96:41)
      at MergeMapSubscriber._loadWorkspaceAndArchitect.pipe.operators_1.concatMap [as project] (/home/linux/Downloads/weather/node_modules/@angular/cli/models/architect-command.js:77:55)
      at MergeMapSubscriber._tryNext (/home/linux/Downloads/weather/node_modules/rxjs/internal/operators/mergeMap.js:122:27)
      at MergeMapSubscriber._next (/home/linux/Downloads/weather/node_modules/rxjs/internal/operators/mergeMap.js:112:18)
      at MergeMapSubscriber.Subscriber.next (/home/linux/Downloads/weather/node_modules/rxjs/internal/Subscriber.js:103:18)
      at TapSubscriber._next (/home/linux/Downloads/weather/node_modules/rxjs/internal/operators/tap.js:109:26)
      at TapSubscriber.Subscriber.next (/home/linux/Downloads/weather/node_modules/rxjs/internal/Subscriber.js:103:18)
      at MergeMapSubscriber.notifyNext (/home/linux/Downloads/weather/node_modules/rxjs/internal/operators/mergeMap.js:141:26)
      at InnerSubscriber._next (/home/linux/Downloads/weather/node_modules/rxjs/internal/InnerSubscriber.js:30:21)
  </code></pre>