我想为Flutter应用程序使用Firestore，但抛出错误。它抛出[core/no-options] Firebase：当未通过源部署到宿主时，需要提供选项。另请参阅：https://futter.dev/docs/testing/errors。也不会让整个脚手架承受荷载。

try {
        await FirebaseAuth.instance.createUserWithEmailAndPassword(
            email: email!.text, password: pass!.text);
        Navigator.pushReplacement(
          context,
          MaterialPageRoute(
            builder: (context) => Home(),
          ),
        );
        FirebaseFirestore.instance
            .collection('userdata')
            .doc(u_name?.text)
            .get()
            .then(
          (DocumentSnapshot documentSnapshot) {
            if (documentSnapshot.exists) {
              final snackBar = SnackBar(
                content: const Text('Username already been taken.'),
                backgroundColor: (Colors.black12),
                action: SnackBarAction(
                  label: 'Dismiss',
                  onPressed: () {},
                ),
              );
              ScaffoldMessenger.of(context).showSnackBar(snackBar);
            } else {
              FirebaseFirestore.instance
                  .collection('userdata')
                  .doc(u_name?.text)
                  .set(
                {
                  'f_name': f_name?.text,
                  'l_name': l_name?.text,
                  'username' : u_name?.text,
                  'email' : email?.text,
                  'pass' : pass?.text,
                },
              );
            }
          },
        );
      }