Project 'production' could not be found in workspace, when i build the angular project for production

Question

I am new to Angular. I use this command ng build --target=production --base-href /, and here is the error that produces while build angular project for production.

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)

Solution

It happened to me after upgrading from Angular 5 to Angular 6.

The solution is to replace in angular.json:

"prod": {
  "fileReplacements": [
    {
      "replace": "src/environments/environment.ts",
      "with": "src/environments/environment.prod.ts"
    }
  ]
},

with:

"production": {
  "fileReplacements": [
    {
      "replace": "src/environments/environment.ts",
      "with": "src/environments/environment.prod.ts"
    }
  ]
},

so basically it's just about renaming prod to production.

Comments

[R. Richards]

Do you get the same error when you run ng build --prod, or ng build --prod --base-href /?

[malikali]

thanks R. Richards I have tried "ng build --prod --base-href /" and project successfully build.but Can you please tell the difference between the command I'm writing and yours.

[R. Richards]

It would seem that you cannot run the build with just a target, you have to include an environment, too. This may be of some help to you. The docs don't explicitly state that you have to include both options, but it does read that way.