1500 unexpected error occur while launching server

[lionel42]

Describe the bug
I configured a session but when I launch it it stops with a non very clear error. see image below

I get this error when lauching the session

Error 500

{"error":{"code":1500,"message":"An unexpected error occurred"}}

Link to project

https://renkulab.io/p/lionel.constantin/gcviz-public#launcher-01JWX2F1X8R9WAT1CHJEBD1P7Z

To Reproduce
Steps to reproduce the behavior:

1. Go to https://renkulab.io/p/lionel.constantin/gcviz-public#launcher-01JWX2F1X8R9WAT1CHJEBD1P7Z
2. Click on Launch
3. See error

Expected behavior

I don't expect it to run if there is a problem in my config, but at least the error message should help be debug what is the problem,
here the message is not really understandable

Screenshots and/or execution output

Run environment (please complete the following information):

Additional context

I am trying to run a dash app, which run in a container.

[leafty]

@lionel42 the image you are trying to use, gitlab-registry.empa.ch/abt503/climate-gases/gcviz-webserver/gcviz:latest, is not publicly pullable. At the moment, RenkuLab does not support using private images from gitlab-registry.empa.ch.

We can let you know once this is supported.

[lionel42]

@leafty Thanks a lot, do you think we could improve the error message for this specific case ?

[leafty]

Yes, we want to provide useful error messages when starting sessions.