Can't export completion as csv

[johngull]

Describe the bug
When I try to export results as CSV, I got Chrome message "undefined". And it seems that real reason is an internal error in the server on "GET /api/export?format=CSV HTTP/1.1" 500 -

Screenshots

Environment (please complete the following information):

• OS: Ubuntu
• Browser: Chrome 83
• Label-studio 0.7.2

[makseq]

Can you show your label config?

[johngull]

Here is it:

<View>
  <Image name="img" value="$image"></Image>
  <Choices name="tag" toName="img" choice="single-radio">
    <Choice value="Overview"></Choice>
    <Choice value="Close view"></Choice>
    <Choice value="Cuted"></Choice>
    <Choice value="Garbage"></Choice>
  </Choices>
</View>

[makseq]

I checked this config, everything is ok. Can you send sample of imported tasks?
Probably the problem is in tasks (maybe any encoding problems?)

[hsethi2709]

I have faced similar issues due to multiple completions on a given task. When I deleted the extra completions on a task and just kept one, exporting CSV was successful. Can you confirm if you have multiple completions as well?

[johngull]

@hsethi2709 How to verify this?

[hsethi2709]

I checked it in the logs and could see errors that said "Currently only one completion can be added per task - we can't convert more than one completions, but 2 completions found in item:" Here the whole task used to be present along with its ID. So you can go to that task and remove that completion.

I am not sure how you can look for multiple completions without checking the log.

I can also see in the converter that they do not support multiple completions for exporting to CSV. I have attached the screenshot of the label-studio-converter that is used for this purpose.

[johngull]

@hsethi2709 I verified result.json and you are right there is repeating of one of the tasks. Thank you for the tip.

@makseq At least it will be nice if UI will show some clear message about this.
And that is strange that I did nothing for repeating the same task. Is it possible to check repeats and remove them in UI?

[johngull]

@makseq By parsing json in a more verbose way, found that there is one image with the missed result and one image with the 2 results. In the same time UI says that all tasks completed.

[makseq]

@hsethi2709 thank you very much!

@johngull Yes, I will add this in the nearest release. But you can use JSON instead of JSON_MIN, it must work with multiple completions.