Ionic 2 tabs app handle navigation error

i am new to ionic2 , i am working on ionic2 tabs app , i am having problems with tabs app.

<ion-tabs >
  <ion-tab [root]="tab1Root" ></ion-tab>
  <ion-tab [root]="tab2Root" ></ion-tab>

here my tab1Root is Homepage and it has ionViewCanEnter guard , now if this guard returns false i need to handle error and navigate to other view , how can i handle error if ionViewCanEnter returns false ?