Flutter 删除颤振中的.bg api http返回后映像

[错误：flatter/lib/ui/ui\u dart\u state.cc（177）]未处理的异常：FormatException:无效

性格 （第1部分） E/颤振（27845）：‰巴布亚新几内亚 E/颤振（27845）：^

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plllzzzzz neeeed help这就是显示的内容[ERROR:flatter/lib/ui/ui_dart_state.cc（177）]未处理的异常：FormatException:Invalid character（在字符1处）E/flatter（27845）：PNG E/flatter（27845）：^[ERROR:flatter/lib/ui/ui_dart_state.cc（177）]未处理的异常：FormatException:Invalid character（在字符1处）E/flatter（27845）：PNG E/flatter（27845）：^[错误：flatter/lib/ui/ui\u dart\u state.cc（177）]未处理的异常：FormatException:无效字符（位于字符1处）E/flatter（27845）：PNG E/flatter（27845）：^

_asyncMethod() async {
ByteData bytes = await rootBundle.load('assets/images/technology.jpg');
var buffer = bytes.buffer;
var m = base64.encode(Uint8List.view(buffer));

final body = {"image_file_b64": m, "size": "auto"};
final headers = {"X-API-Key": "xxxxxxxxxxxxxxxxxxxx"};
final response = await http.post('https://api.remove.bg/v1.0/removebg',
    body: body, headers: headers);

if (response.statusCode == 200) {
  responseBody = response.body;
  var jsonResponse = convert.jsonDecode(response.body);
  debugPrint("$jsonResponse");
  //var itemCount = jsonResponse['data'];
  // ignore: unnecessary_statements
} else {
  throw Exception(
      'Failed to do network requests: Error Code: ${response.statusCode}\nBody: ${response.body}');
}