Ionic2 Loading component error

[iignatov]

There’s an open issue about this:

Ionic v2 - Loading Service - Throwing error "cannot read property 'nativeElement' ..."

As a workaround try the suggestion in the linked post:

@AndyM3Kt

If you want to be sure that NavController has finished presenting your loading component you can move your code into the promise that this.nav.present() returns:

In your case you should update your code this way:

           this.nav.present(this.loading).then(() => {
                if (this.user.login(this.login.username, this.login.password)) {
                    //this.loading.dismiss();
                    this.viewCtrl.dismiss();
                    this.nav.setRoot(DashboardPage);
                }
                else {
                    this.loading.dismiss();
                }
            });