Http status error [500] when uploading image in multipart

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New Issue Checklist

DioError [DioErrorType.response]: Http status error [500]
Source stack:
#0 DioMixin.fetch (package:dio/src/dio_mixin.dart:4

#0 DioMixin.fetch (package:dio/src/dio_mixin.dart:488:35)
#1 DioMixin.request (package:dio/src/dio_mixin.dart:483:12)
#2 DioMixin.post (package:dio/src/dio_mixin.dart:97:12)
#3 HttpService.executeRequest (package:aaaa /api_core/http_service.dart:161:32)

#4 RequestManager.executeDataRequest (package:aaaa /api_core/request_manager.dart:32:20)

#5 ProfileNetwork.editProfile (package:aaaa /screens/tab_profile/profile_network.dart:35:26)

#6 _ProfileViewState.editProfile (package:aaaa /screens/tab_profile/profile_view.dart:485:16)

[iresolveservices]

my code

try{
response = await dio.post(
request.url,
data: formData,
options: Options(headers: {
'Accept': 'application/json',
}, contentType: "application/x-www-form-urlencoded",),
);
debugPrint('request.formData response ${response}');
} on DioError catch (e) {
tokenMap.remove(cancelToken);
if (!completer.isCompleted) {
completer.complete(_parseErrorResponse(e, request));
}
}

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var mPart= request.file!=null && request.file!=''? await MultipartFile.fromFile('${request.file}', filename: 'upload.png',):'';

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it closed accidentally