Singin request with firebase is not working - flutter

Question

I'm having a problem trying to do a login validation with firebase. Coincidentally I can create a new firebase account register it and I can enter my application. but when I go back to the home screen, I can't log in with that registered account. What do you think is the mistake I'm making?.
The console returns this to me.
Error image
my screen code
class AuthScreen extends StatefulWidget {
const AuthScreen({Key? key}) : super(key: key);
#override
State<AuthScreen> createState() => _AuthScreenState();
}
class _AuthScreenState extends State<AuthScreen> {
final _auth = FirebaseAuth.instance;
var _isLoading = false;
void _submitAuthForm(
String email,
String userName,
String password,
bool isLogin,
BuildContext ctx,
) async {
UserCredential authResult;
try {
setState(() {
_isLoading = true;
});
if (isLogin) {
authResult = await _auth.signInWithEmailAndPassword(
email: email, password: password);
} else {
authResult = await _auth.createUserWithEmailAndPassword(
email: email, password: password);
await FirebaseFirestore.instance
.collection('users')
.doc(authResult.user!.uid)
.set({
'username': userName,
'email': email,
});
}
} on PlatformException catch (err) {
var message = 'An error ocurred, Please check your credentials';
if (err.message != null) {
message = err.message!;
}
Scaffold.of(ctx).showSnackBar(SnackBar(
content: Text(message),
backgroundColor: Theme.of(ctx).errorColor,
));
setState(() {
_isLoading = false;
});
} catch (err) {
print(err);
setState(() {
_isLoading = false;
});
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Theme.of(context).primaryColor,
body: AuthForm(_submitAuthForm, _isLoading),
);
}
}
authentication code
class AuthForm extends StatefulWidget {
AuthForm(this.submitFn, this.isLoading);
final bool isLoading;
final void Function(String email, String userName, String password,
bool isLogin, BuildContext ctx) submitFn;
#override
State<AuthForm> createState() => _AuthFormState();
}
class _AuthFormState extends State<AuthForm> {
final _formKey = GlobalKey<FormState>();
var _isLogin = true;
var _userEmail = '';
var _userName = '';
var _userPassword = '';
void _trySubmit() {
final isValid = _formKey.currentState!.validate();
FocusScope.of(context).unfocus();
if (isValid) {
_formKey.currentState!.save();
widget.submitFn(
_userEmail.trim(),
_userPassword.trim(),
_userName.trim(),
_isLogin,
context,
);
}
}
#override
Widget build(BuildContext context) {
return Center(
child: Card(
margin: EdgeInsets.all(20),
child: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.all(16),
child: Form(
key: _formKey,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
TextFormField(
key: ValueKey('email'),
validator: (value) {
if (value!.isEmpty ||
!value.contains('#') ||
!value.contains('.com')) {
return 'Please enter a valid email';
}
return null;
},
keyboardType: TextInputType.emailAddress,
decoration: InputDecoration(labelText: 'Email address'),
onSaved: (value) {
_userEmail = value!;
},
),
if (!_isLogin)
TextFormField(
key: ValueKey('username'),
validator: (value) {
if (value!.isEmpty || value.length < 4) {
return 'Please enter at least 4 characters';
}
return null;
},
decoration: InputDecoration(labelText: 'Username'),
onSaved: (value) {
_userName = value!;
},
),
TextFormField(
key: ValueKey('password'),
validator: (value) {
if (value!.isEmpty || value.length < 7) {
return 'Password must be at least 7 characters long';
}
return null;
},
decoration: InputDecoration(labelText: 'Password'),
obscureText: true,
onSaved: (value) {
_userPassword = value!;
},
),
SizedBox(
height: 15,
),
if (widget.isLoading) CircularProgressIndicator(),
if (!widget.isLoading)
ElevatedButton(
onPressed: _trySubmit,
child: Text(_isLogin ? 'Login' : 'Signup'),
),
if (!widget.isLoading)
TextButton(
onPressed: () {
setState(() {
_isLogin = !_isLogin;
});
},
child: Text(_isLogin
? 'Create new account'
: 'I already have a account'))
],
)),
),
),
));
}
}