tutorial not working: Text classification with Scikit-Learn

[az0]

Describe the bug

I am following the official tutorial for a simple text classifier , but label-studio start causes crash. Also, the label-studio-ml development log shows errors when labeling, training, or requesting predictions.

To Reproduce

1. I followed the steps in the official text classifier tutorial
2. I used the "development mode" backend option
3. When running label-studio start my_project --init --ml-backends http://localhost:9090, I got a traceback (see attachment), so instead, I created a project myself in the web interface
4. I imported a CSV file with 32 short texts. (I would appreciate the tutorial providing a sample file.)
5. I enabled pretraining
6. I clicked "send test request" and it seemed to work. The ml backend shows a /predict request with status 200.
7. I labeled texts. When opening a record, there is a traceback. See attachment label-studio-ml-open-for-label.log
8. When submitting a label, there was a traceback. See attachment label-studio-submit-label.log
9. I clicked "start training" and got a similar traceback.
10. I checked three tasks and clicked "request predictions" and got a similar traceback

Expected behavior

• No traceback
• Show predictions in label-studio

Screenshots

start_project.log
label-studio-ml-open-for-label.log
label-studio-submit-label.log

Environment (please complete the following information):
label-studio 1.13.1
label-studio-ml 1.0.9
label-studio-sdk 1.0.5
label-studio-tools 0.0.4
Python 3.12.3
Ubuntu 24.04 (Noble)