OHIF changing to the black screen during the loading

Good day,

I have a small question. I tried to do this tutorial - GitHub - Project-MONAI/MONAILabel: MONAI Label is an intelligent open source image labeling and learning tool.

Monai label server is working correctly, however when I use this link - http://127.0.0.1:8000/ohif/

It displays OHIF correctly only for a few seconds and after this it switched into black screen. Could you please help me to find my mistake. I think maybe it cant find any data, that is why it switches to the black screen?