You attempted to access the Error property for a successful result. A successful result has no Error.

I have receiving You attempted to access the Error property for a successful result. A successful result has no Error. error when I send value from service to controller. I receive it on service level.

public async Task<CSharpFunctionalExtensions.Result<QuestionDto>> GetQuestionWithElementsById2(int id)
    {
        var questionWithElements = await _tenantUnitOfWork.QuestionRepository.GetQuestionWithElementsById(id);

        var questionsWithElementsDto = _mapper.Map<QuestionDto>(questionWithElements);

        return Result.Success<QuestionDto>(questionsWithElementsDto);
    }

[hankovich]

The stacktrace shows that this error was thrown during response formatting, i.e. result was returned not only from service to controller, but also it was returned from controller itself.

If you want to return results from controller, you may use this extension to add corresponding converters for System.Text.Json.

[namigmustafa]

huge thanks