E/flutter（6866）：[错误：flutter/lib/ui/ui_dart_state.cc（148）]未处理异常：无效参数

Question

i have 2 same code on my app as below, but in the code below I experienced an error and in the other code there was no error at all.

Future _simpandatadok(File prof, File prak) async {
    final form = formkey.currentState;
    if (form.validate()) {
      var stream = new http.ByteStream(DelegatingStream.typed(prof.openRead()));
      var stream1 =
          new http.ByteStream(DelegatingStream.typed(prak.openRead()));
      var length = await prof.length();
      var uri = Uri.parse("http://10.0.2.2/my_vet/registerdokter.php");
      var request = new http.MultipartRequest("POST", uri);
      var multipartfile = new http.MultipartFile("image", stream, length,
          filename: p.basename(prof.path));
      request.fields['email'] = _email.text;
      request.fields['passw'] = _pass.text;
      request.fields['nama'] = _nama.text;
      request.fields['telp'] = _telp.text;
      request.files.add(multipartfile);
      request.files.add(multipartfile1);
      var response = await request.send();
    }
  }

Here is the error

E/flutter ( 6866): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Invalid argument(s)
E/flutter ( 6866): #0      _RegExp.hasMatch  (dart:core-patch/regexp_patch.dart:249:25)
E/flutter ( 6866): #1      isPlainAscii 
E/flutter ( 6866): #2      MultipartRequest._headerForField 
E/flutter ( 6866): #3      MultipartRequest.finalize.<anonymous closure> 
E/flutter ( 6866): #4      _LinkedHashMapMixin.forEach  (dart:collection-patch/compact_hash.dart:377:8)
E/flutter ( 6866): #5      MultipartRequest.finalize 
E/flutter ( 6866): #6      IOClient.send 
E/flutter ( 6866): <asynchronous suspension>
E/flutter ( 6866): #7      BaseRequest.send 
E/flutter ( 6866): <asynchronous suspension>
E/flutter ( 6866): #8      _RegisterDokterState._simpandatadok 
E/flutter ( 6866): <asynchronous suspension>
E/flutter ( 6866): #9      _RegisterDokterState.build.<anonymous closure> 

the error occur on the line var response = await request.send();

Answer 1

did you check if the send method is an async method? or if you miss some argument?