ionic2 - Error after firebase authentication using facebook -


i'm trying authenticate user using facebook through firebase: login

but getting [object object] error: loginfailed

my code login is:

facebooklogin(): void {     this.fb.login(['email']).then( (response) => {         const facebookcredential = firebase.auth.facebookauthprovider           .credential(response.authresponse.accesstoken);          firebase.auth().signinwithcredential(facebookcredential)          .then((success) => {             alert("firebase success: ");             this.userprofile = success;          })         .catch((error) => {             alert(error);         });     }).catch((error) => {alert(error); }); }

all of documentation see requests both email , public_profile in login function, perhaps error.

this.fb.login(['email', 'public_profile']).then( (response) => {

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