[ionic4] ion-tab is an Angular component

Ionic Framework ionic-v3
1

Hi Guys, i upgrate from ionic 4 beta 19 to laste update [4.0.0-rc.0]
and now i have error:

compiler.js:2427 Uncaught Error: Template parse errors:
'ion-tab' is not a known element:
1. If 'ion-tab' is an Angular component, then verify that it is part of this module.
2. If 'ion-tab' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("<ion-tabs>

  [ERROR ->]<ion-tab tab="video">
    <ion-router-outlet name="home"></ion-router-outlet>
  </ion-tab>
"): ng:///AppModule/TabsPage.html@2:2
'ion-tab' is not a known element:
1. If 'ion-tab' is an Angular component, then verify that it is part of this module.
2. If 'ion-tab' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <ion-router-outlet name="home"></ion-router-outlet>
  </ion-tab>
  [ERROR ->]<ion-tab tab="ebook">
    <ion-router-outlet name="ebook"></ion-router-outlet>
  </ion-tab>
"): ng:///AppModule/TabsPage.html@5:2
'ion-tab' is not a known element:
1. If 'ion-tab' is an Angular component, then verify that it is part of this module.
2. If 'ion-tab' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <ion-router-outlet name="ebook"></ion-router-outlet>
  </ion-tab>
  [ERROR ->]<ion-tab tab="settings">
    <ion-router-outlet name="settings"></ion-router-outlet>
  </ion-tab>

Ionic:

   ionic (Ionic CLI)             : 4.3.1 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.0.0-rc.0
   @angular-devkit/build-angular : 0.10.6
   @angular-devkit/schematics    : 7.1.4
   @angular/cli                  : 7.1.4
   @ionic/angular-toolkit        : 1.2.2

can some one help me with that error?

thanks

2

Breaking changes from beta.18

Take a look here
ion-tab was removed as a necessary element for tabs

3

I have faced this problem couple of days ago, check for the solution here Ionic 4 RC ion-tab is not known element on blank project

4

tnx i understand now the problem :slight_smile: