我已经把pub yaml升级到了flutter pub upgrade --major versions的主版本，它给了我很多建议，我不明白为什么会出错？有人能解释一下吗？
这是一个例子，它说Do not use BuildContexts across async gaps我应该怎么做。

_resetEmail(String password,) async {
    final user = FirebaseAuth.instance.currentUser;
    final credential =
        EmailAuthProvider.credential(email: user!.email!, password: password);
    try {
      UserCredential;
      await FirebaseAuth.instance.currentUser
          ?.reauthenticateWithCredential(credential);

       ///The problem is here
      Navigator.push(
          context,
          PageTransition(
              type: PageTransitionType.rightToLeft,
              child: const ResetEmailScreen()));
        ///

    } on FirebaseAuthException {
      Fluttertoast.showToast(
        msg: 'Wrong password',
        gravity: ToastGravity.TOP,
        toastLength: Toast.LENGTH_LONG,
        backgroundColor: Colors.grey[400],
        textColor: Colors.black,
      );
    }
  }