rendered flex, rendered box was not laid

return Material(
      child: Scaffold(
        resizeToAvoidBottomInset: false,
        appBar: AppBar(
          leading: const Icon(
            Icons.arrow_back,
            color: Colors.white,
          ),
          elevation: 5,
          title: const Text(
            "GPS",
          ),
        ),
        body: Container(
          width: 130,
          margin: const EdgeInsets.all(10),
          child: SingleChildScrollView(
            child: Column(
              children: [
                SizedBox(
                  height: 10,
                  child: TextFormField(
                    controller: latT,
                    decoration: InputDecoration(
                      labelText: "Latitude",
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(10),
                      ),
                    ),
                  ),
                ),
                Flexible(
                  child: TextFormField(
                    controller: longT,
                    decoration: InputDecoration(
                      labelText: "Longitude",
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(10),
                      ),
                    ),
                  ),
                ),
                Flexible(
                  child: TextFormField(
                    controller: ketT,
                    decoration: InputDecoration(
                      labelText: "Keterangan",
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(10),
                      ),
                    ),
                  ),
                ),
                Flexible(
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceAround,
                    children: [
                      ElevatedButton(
                        style: ButtonStyle(
                          backgroundColor:
                              MaterialStateProperty.all(Colors.greenAccent),
                        ),
                        onPressed: () async {
                          saveData();
                        },
                        child: const Text("Simpan Data"),
                      ),
                      ElevatedButton(
                        onPressed: () {
                          checkGps();
                        },
                        child: const Text("Get GPS"),
                      ),
                    ],
                  ),
                ),
                /*ListView.builder(
                  scrollDirection: Axis.vertical,
                  shrinkWrap: true,
                  itemCount: _journals.length,
                  itemBuilder: (context, index) => Card(
                    color: Colors.orange[200],
                    margin: const EdgeInsets.all(15),
                    child: ListTile(
                      title: Text(
                        _journals[index]['id'],
                      ),
                      subtitle: Text(
                        _journals[index]['lat'],
                      ),
                      trailing: SizedBox(
                        width: 100,
                        child: Row(
                          children: [
                            IconButton(
                              icon: const Icon(Icons.edit),
                              onPressed: () {},
                            ),
                            IconButton(
                              icon: const Icon(Icons.delete),
                              onPressed: () =>
                                  _deleteItem(_journals[index]['id']),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                ),*/
              ],
            ),
            /*Text(servicestatus ? "GPS is Enabled" : "GPS is disabled."),
                  Text(haspermission ? "GPS is Enabled" : "GPS is disabled."),*/
          ),
        ),
      ),
    );