Error with dependencies when running the project

[razfazz]

When running your sample project i receive the following error.

Because firebase_auth >=0.18.4 <=0.18.4 depends on firebase_auth_web ^0.3.2+2 and firebase_auth ^0.18.4+1 depends on firebase_auth_web ^0.3.2+3, firebase_auth ^0.18.4 requires firebase_auth_web ^0.3.2+2.
(1) So, because firebase_auth >=0.18.3+1 <0.18.4 depends on firebase_auth_web ^0.3.2+1, firebase_auth ^0.18.3+1 requires firebase_auth_web ^0.3.2+1.

Because firebase_auth >=0.18.3 <=0.18.3 depends on firebase_auth_web ^0.3.2 and firebase_auth >=0.18.2 <0.18.3 depends on firebase_auth_web ^0.3.1+2, firebase_auth >=0.18.2 <=0.18.3 requires firebase_auth_web ^0.3.1+2.        
And because firebase_auth >=0.18.1+2 <0.18.2 depends on firebase_auth_web ^0.3.1+1, firebase_auth >=0.18.1+2 <=0.18.3 requires firebase_auth_web ^0.3.1+1.
And because firebase_auth >=0.18.1 <=0.18.1+1 depends on firebase_auth_web ^0.3.1 and no versions of firebase_auth match >0.18.0+1 <0.18.1, firebase_auth >0.18.0+1 <=0.18.3 requires firebase_auth_web ^0.3.1.
And because firebase_auth ^0.18.3+1 requires firebase_auth_web ^0.3.2+1 (1), firebase_auth >0.18.0+1 <0.19.0 requires firebase_auth_web ^0.3.1.
And because firebase_auth 0.18.0+1 depends on firebase_auth_web ^0.3.0+1, firebase_auth ^0.18.0+1 requires firebase_auth_web ^0.3.0+1.
And because firebase_auth_web >=0.3.0-dev.1 <0.4.0-1.0.nullsafety.0 depends on intl ^0.16.1 and every version of flutter_localizations from sdk depends on intl 0.17.0-nullsafety.2, firebase_auth ^0.18.0+1 is incompatible with 

flutter_localizations from sdk.
So, because flutter_starter depends on both flutter_localizations any from sdk and firebase_auth ^0.18.0+1, version solving failed.
Running "flutter pub get" in flutter_starter-master...
pub get failed (1; So, because flutter_starter depends on both flutter_localizations any from sdk and firebase_auth ^0.18.0+1, version solving failed.)

[delay]

Thanks I tried fixing the trouble but it seems there are some bugs with the localization. aloisdeniel/flutter_sheet_localization#32 As soon as this is updated I will try to update the plugin. Also some functions in firebase have changed yet again which is now the second time in a few months. I think I fixed all of that but don't want to update until I can fully test the app. Also updated the pubspec.yaml with :any for everything. You can see if these two changes fix it for you.

auth_controller.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'dart:async';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:get/get.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:simple_gravatar/simple_gravatar.dart';
import 'package:flutter_starter/localizations.dart';
import 'package:flutter_starter/models/models.dart';
import 'package:flutter_starter/ui/auth/auth.dart';
import 'package:flutter_starter/ui/ui.dart';
import 'package:flutter_starter/ui/components/components.dart';

class AuthController extends GetxController {
  static AuthController to = Get.find();
  AppLocalizations_Labels labels;
  TextEditingController nameController = TextEditingController();
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final FirebaseFirestore _db = FirebaseFirestore.instance;
  Rx<FirebaseUser> firebaseUser = Rx<FirebaseUser>();
  Rx<UserModel> firestoreUser = Rx<UserModel>();
  final RxBool admin = false.obs;

  @override
  void onReady() async {
    //run every time auth state changes
    ever(firebaseUser, handleAuthChanged);
    firebaseUser.value = await getUser;
    firebaseUser.bindStream(user);
    super.onReady();
  }

  @override
  void onClose() {
    nameController?.dispose();
    emailController?.dispose();
    passwordController?.dispose();
    super.onClose();
  }

  handleAuthChanged(_firebaseUser) async {
    //get user data from firestore
    if (_firebaseUser?.uid != null) {
      firestoreUser.bindStream(streamFirestoreUser());
      await isAdmin();
    }

    if (_firebaseUser == null) {
      Get.offAll(SignInUI());
    } else {
      Get.offAll(HomeUI());
    }
  }

  // Firebase user one-time fetch
  Future<FirebaseUser> get getUser async => _auth.currentUser();

  // Firebase user a realtime stream
  Stream<FirebaseUser> get user => _auth.onAuthStateChanged;

  //Streams the firestore user from the firestore collection
  Stream<UserModel> streamFirestoreUser() {
    print('streamFirestoreUser()');
    if (firebaseUser?.value?.uid != null) {
      return _db
          .doc('/users/${firebaseUser.value.uid}')
          .snapshots()
          .map((snapshot) => UserModel.fromMap(snapshot.data()));
    }

    return null;
  }

  //get the firestore user from the firestore collection
  Future<UserModel> getFirestoreUser() {
    if (firebaseUser?.value?.uid != null) {
      return _db.doc('/users/${firebaseUser.value.uid}').get().then(
          (documentSnapshot) => UserModel.fromMap(documentSnapshot.data()));
    }
    return null;
  }

  //Method to handle user sign in using email and password
  signInWithEmailAndPassword(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth.signInWithEmailAndPassword(
          email: emailController.text.trim(),
          password: passwordController.text.trim());
      emailController.clear();
      passwordController.clear();
      hideLoadingIndicator();
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.signInErrorTitle, labels.auth.signInError,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 7),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  // User registration using email and password
  registerWithEmailAndPassword(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth
          .createUserWithEmailAndPassword(
              email: emailController.text, password: passwordController.text)
          .then((result) async {
        print('uID: ' + result.uid);
        print('email: ' + result.email);
        //get photo url from gravatar if user has one
        Gravatar gravatar = Gravatar(emailController.text);
        String gravatarUrl = gravatar.imageUrl(
          size: 200,
          defaultImage: GravatarImage.retro,
          rating: GravatarRating.pg,
          fileExtension: true,
        );
        //create the new user object
        UserModel _newUser = UserModel(
            uid: result.uid,
            email: result.email,
            name: nameController.text,
            photoUrl: gravatarUrl);
        //create the user in firestore
        _createUserFirestore(_newUser, result);
        emailController.clear();
        passwordController.clear();
        hideLoadingIndicator();
      });
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.signUpErrorTitle, error.message,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //handles updating the user when updating profile
  Future<void> updateUser(BuildContext context, UserModel user, String oldEmail,
      String password) async {
    final labels = AppLocalizations.of(context);
    try {
      showLoadingIndicator();
      await _auth
          .signInWithEmailAndPassword(email: oldEmail, password: password)
          .then((_firebaseUser) {
        _firebaseUser
            .updateEmail(user.email)
            .then((value) => _updateUserFirestore(user, _firebaseUser));
      });
      hideLoadingIndicator();
      Get.snackbar(labels.auth.updateUserSuccessNoticeTitle,
          labels.auth.updateUserSuccessNotice,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 5),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    } on PlatformException catch (error) {
      //List<String> errors = error.toString().split(',');
      // print("Error: " + errors[1]);
      hideLoadingIndicator();
      print(error.code);
      String authError;
      switch (error.code) {
        case 'ERROR_WRONG_PASSWORD':
          authError = labels.auth.wrongPasswordNotice;
          break;
        default:
          authError = labels.auth.unknownError;
          break;
      }
      Get.snackbar(labels.auth.wrongPasswordNoticeTitle, authError,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //updates the firestore user in users collection
  void _updateUserFirestore(UserModel user, FirebaseUser _firebaseUser) {
    _db.doc('/users/${_firebaseUser.uid}').update(user.toJson());
    update();
  }

  //create the firestore user in users collection
  void _createUserFirestore(UserModel user, FirebaseUser _firebaseUser) {
    _db.doc('/users/${_firebaseUser.uid}').set(user.toJson());
    update();
  }

  //password reset email
  Future<void> sendPasswordResetEmail(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth.sendPasswordResetEmail(email: emailController.text);
      hideLoadingIndicator();
      Get.snackbar(
          labels.auth.resetPasswordNoticeTitle, labels.auth.resetPasswordNotice,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 5),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.resetPasswordFailed, error.message,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //check if user is an admin user
  isAdmin() async {
    await getUser.then((user) async {
      DocumentSnapshot adminRef =
          await _db.collection('admin').doc(user?.uid).get();
      if (adminRef.exists) {
        admin.value = true;
      } else {
        admin.value = false;
      }
      update();
    });
  }

  // Sign out
  Future<void> signOut() {
    nameController.clear();
    emailController.clear();
    passwordController.clear();
    return _auth.signOut();
  }
}

[delay]

This should now be resolved. Let me know if you still have issues.

[delay]

just a note about modification to auth_controller.
updated auth_controller.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'dart:async';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:get/get.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:simple_gravatar/simple_gravatar.dart';
import 'package:flutter_starter/localizations.dart';
import 'package:flutter_starter/models/models.dart';
import 'package:flutter_starter/ui/auth/auth.dart';
import 'package:flutter_starter/ui/ui.dart';
import 'package:flutter_starter/ui/components/components.dart';

class AuthController extends GetxController {
  static AuthController to = Get.find();
  AppLocalizations_Labels labels;
  TextEditingController nameController = TextEditingController();
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final FirebaseFirestore _db = FirebaseFirestore.instance;
  Rx<User> firebaseUser = Rx<User>();
  Rx<UserModel> firestoreUser = Rx<UserModel>();
  final RxBool admin = false.obs;

  @override
  void onReady() async {
    //run every time auth state changes
    ever(firebaseUser, handleAuthChanged);
    firebaseUser.value = await getUser;
    firebaseUser.bindStream(user);
    super.onReady();
  }

  @override
  void onClose() {
    nameController?.dispose();
    emailController?.dispose();
    passwordController?.dispose();
    super.onClose();
  }

  handleAuthChanged(_firebaseUser) async {
    //get user data from firestore
    if (_firebaseUser?.uid != null) {
      firestoreUser.bindStream(streamFirestoreUser());
      await isAdmin();
    }

    if (_firebaseUser == null) {
      Get.offAll(SignInUI());
    } else {
      Get.offAll(HomeUI());
    }
  }

  // Firebase user one-time fetch
  Future<User> get getUser async => _auth.currentUser;

  // Firebase user a realtime stream
  Stream<User> get user => _auth.authStateChanges();

  //Streams the firestore user from the firestore collection
  Stream<UserModel> streamFirestoreUser() {
    print('streamFirestoreUser()');
    if (firebaseUser?.value?.uid != null) {
      return _db
          .doc('/users/${firebaseUser.value.uid}')
          .snapshots()
          .map((snapshot) => UserModel.fromMap(snapshot.data()));
    }

    return null;
  }

  //get the firestore user from the firestore collection
  Future<UserModel> getFirestoreUser() {
    if (firebaseUser?.value?.uid != null) {
      return _db.doc('/users/${firebaseUser.value.uid}').get().then(
          (documentSnapshot) => UserModel.fromMap(documentSnapshot.data()));
    }
    return null;
  }

  //Method to handle user sign in using email and password
  signInWithEmailAndPassword(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth.signInWithEmailAndPassword(
          email: emailController.text.trim(),
          password: passwordController.text.trim());
      emailController.clear();
      passwordController.clear();
      hideLoadingIndicator();
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.signInErrorTitle, labels.auth.signInError,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 7),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  // User registration using email and password
  registerWithEmailAndPassword(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth
          .createUserWithEmailAndPassword(
              email: emailController.text, password: passwordController.text)
          .then((result) async {
        print('uID: ' + result.user.uid);
        print('email: ' + result.user.email);
        //get photo url from gravatar if user has one
        Gravatar gravatar = Gravatar(emailController.text);
        String gravatarUrl = gravatar.imageUrl(
          size: 200,
          defaultImage: GravatarImage.retro,
          rating: GravatarRating.pg,
          fileExtension: true,
        );
        //create the new user object
        UserModel _newUser = UserModel(
            uid: result.user.uid,
            email: result.user.email,
            name: nameController.text,
            photoUrl: gravatarUrl);
        //create the user in firestore
        _createUserFirestore(_newUser, result.user);
        emailController.clear();
        passwordController.clear();
        hideLoadingIndicator();
      });
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.signUpErrorTitle, error.message,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //handles updating the user when updating profile
  Future<void> updateUser(BuildContext context, UserModel user, String oldEmail,
      String password) async {
    final labels = AppLocalizations.of(context);
    try {
      showLoadingIndicator();
      await _auth
          .signInWithEmailAndPassword(email: oldEmail, password: password)
          .then((_firebaseUser) {
        _firebaseUser.user
            .updateEmail(user.email)
            .then((value) => _updateUserFirestore(user, _firebaseUser.user));
      });
      hideLoadingIndicator();
      Get.snackbar(labels.auth.updateUserSuccessNoticeTitle,
          labels.auth.updateUserSuccessNotice,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 5),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    } on PlatformException catch (error) {
      //List<String> errors = error.toString().split(',');
      // print("Error: " + errors[1]);
      hideLoadingIndicator();
      print(error.code);
      String authError;
      switch (error.code) {
        case 'ERROR_WRONG_PASSWORD':
          authError = labels.auth.wrongPasswordNotice;
          break;
        default:
          authError = labels.auth.unknownError;
          break;
      }
      Get.snackbar(labels.auth.wrongPasswordNoticeTitle, authError,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //updates the firestore user in users collection
  void _updateUserFirestore(UserModel user, User _firebaseUser) {
    _db.doc('/users/${_firebaseUser.uid}').update(user.toJson());
    update();
  }

  //create the firestore user in users collection
  void _createUserFirestore(UserModel user, User _firebaseUser) {
    _db.doc('/users/${_firebaseUser.uid}').set(user.toJson());
    update();
  }

  //password reset email
  Future<void> sendPasswordResetEmail(BuildContext context) async {
    final labels = AppLocalizations.of(context);
    showLoadingIndicator();
    try {
      await _auth.sendPasswordResetEmail(email: emailController.text);
      hideLoadingIndicator();
      Get.snackbar(
          labels.auth.resetPasswordNoticeTitle, labels.auth.resetPasswordNotice,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 5),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    } catch (error) {
      hideLoadingIndicator();
      Get.snackbar(labels.auth.resetPasswordFailed, error.message,
          snackPosition: SnackPosition.BOTTOM,
          duration: Duration(seconds: 10),
          backgroundColor: Get.theme.snackBarTheme.backgroundColor,
          colorText: Get.theme.snackBarTheme.actionTextColor);
    }
  }

  //check if user is an admin user
  isAdmin() async {
    await getUser.then((user) async {
      DocumentSnapshot adminRef =
          await _db.collection('admin').doc(user?.uid).get();
      if (adminRef.exists) {
        admin.value = true;
      } else {
        admin.value = false;
      }
      update();
    });
  }

  // Sign out
  Future<void> signOut() {
    nameController.clear();
    emailController.clear();
    passwordController.clear();
    return _auth.signOut();
  }
}