当我尝试将图像上传到flutter应用程序中的数据库时出现此错误

import 'package:connectivity/connectivity.dart';

Future<bool> checkNetwork() async {
  var connectivityResult = await (Connectivity().checkConnectivity());
  return connectivityResult != ConnectivityResult.none;
}

import 'dart:io';
import 'package:http/http.dart' as http;

Future<void> uploadImage(File imageFile) async {
  var url = 'https://your-server-url/upload';
  var request = http.MultipartRequest('POST', Uri.parse(url));
  request.files.add(await http.MultipartFile.fromPath('image', imageFile.path));

  try {
    var response = await request.send();
    if (response.statusCode == 200) {
      print('Image uploaded successfully');
    } else {
      print('Failed to upload image');
    }
  } catch (e) {
    print('Error uploading image: $e');
  }
}