Ionic Giving Typescript Error While Building

Hello i am trying to build android application for production using command ionic cordova build android --prod The problem is that after running this code it is giving me this foll

Solution 1:

I have faced this issue several times as ionic says a specific page is part of two declarations one is our main app component declarations and the second is individual components modules. So basically removing it from individual component.module.ts file works for me so try removing the page declaration from your contact.module.ts file

@NgModule({
  declarations : [
                     //keep this empty 
  ],
  imports : [
   .... 
  ]

Solution 2:

Remove "ContactsPage" from "declaration" and entry "components" in your "AppModule.ts" as it is already imported in "contact.module.ts"

Solution 3:

You don't need to declare ContactPage in the app.module.ts file as it is already declared in the contact.module.ts file. So, you have to remove the ContactPage from declarations and entryComponents in the app.module.ts file.