500 Server Error when creating study - ibt-hsg.herokuapp.com/api/sessions failing #24
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Hi Error ID: invalid_url_error Is there currently a server issue? Any estimated time for resolution? |
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Replies: 6 comments 9 replies
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Hi Natalia, the server works just fine (it works if try to create a session with the placeholder csv https://raw.githubusercontent.com/DICE-app/sample-feeds/refs/heads/main/feeds/9gag.csv). I therefore assume that there is an issue with the csv file you created. Can you share the corresponding URL with me? |
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Hi, Thanks for the quick response! Here's my CSV file URL: BTW The preview works fine - I can see all the posts displaying correctly. |
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When reading files from your gDrive, the software currently expects a slightly different pattern. I will test this and work on a solution or provide a more detailed answer. But until then I would recommend you to just upload your csv file to github and then copy the raw URl. Can you verify whether this works? |
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The Problem: The Cause: The Fix: The Result: Thank you for reporting this issue! It helped me identify a gap in how the software handles different Google Drive URL formats, which will make it more robust for everyone ... hopefully 🤞. |
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Thank you so much, it works perfectly now. |
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Hi again, |
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Just to confirm: you still use these stimuli?
I just tested them and was able to create a session without issues. Unfortunately, we have not yet implemented web analytics, so I cannot see your specific configuration or settings. This makes it harder to diagnose the problem remotely. One additional note: the frontend verification is not perfect. It mimics some of the backend logic but runs independently from it. This means that sometimes configurations pass the frontend checks but still fail when processed by the backend. If I understand correctly, you successfully created a session 40 minutes ago, but now the same process no longer works. Did you change anything between then and now? |
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Hi, i get: |
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Yes, I saw that session but I cannot see how you configured it in the web app. When I use that csv file without further adjusting any of the default settings, (see attached json) I can create this session and see the feed. In that feed, I can see that you configured the csv in a way that the first post is shwon on top while all the others are displayed as comments to this post. Can you check whether you can access my session by clicking the link above? Can you also test what happens when you upload the json file (pretending to be a returning user)? Does it recreate the session? I am sorry for the inconvenience. |
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Alternatively, can you reach out to hauke.roggenkamp@unisg.ch so that we schedule a quick zoom call? |
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Hi, |
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BTW: when testing the app and playing around with session configurations, please keep the sessions small to avoid unnecessary database strain. Hence, choose something like 10 study slots or so. |
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Hi, I'm back working on another study using DICE and running into a similar issue as last time. The link test passes successfully, but session creation fails with the following error: Error ID: invalid_url_error CSV link: https://drive.google.com/uc?export=download&id=1vKwQ4R6ncJJzjQmi8B_4-drvMSUUVkSL Thanks so much, |
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Hi Natalia, the problem was that your conditions were numeric (while DICE was expecting a string such as "A" or "B") . As I don't remember why I designed it that way, I just updated the code to allow for numeric values as well 🤞. Your csv file should work now. Sorry for the inconvenience and good luck with your study. Best, |
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Thank you! It works perfectly now
בתאריך יום ב׳, 23 במרץ 2026 ב-10:35 מאת Hauke Roggenkamp <
***@***.***>:
… Hi Natalia,
the problem was that your conditions were numeric (while DICE was
expecting a string such as "A" or "B") . As I don't remember why I designed
it that way, I just updated the code to allow for numeric values as well 🤞.
Your csv file should work now. Sorry for the inconvenience and good luck
with your study.
Best,
Hauke
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The Problem:
You tried to upload a CSV file from Google Drive to create a study session. The software rejected the link and threw an error ("invalid_url_error").
The Cause:
Google Drive links can have different formats. The software expected links in one specific format (like
drive.google.com/file/d/FILE_ID/view) but you provided a link in a different format (likedrive.google.com/uc?export=download&id=FILE_ID). The software tried to extract the file ID from the wrong part of the URL, which caused it to fail.The Fix:
I updated the code to recognize both types of Google Drive link formats. Now the software can handle links that are already in the direct download format without trying to r…