Image not showing when generating dataset

[darwin.keem]

Hi, I’m working on making dataset for segmentation problem.
When I try to generate dataset and export it, no images are displayed in the generating tab. Additionally, there are no images and masks when I export the dataset. Is there any solutions to this? Thanks.

1. Project type: Semantic Segmentation with Polygons
2. Ubuntu 20.04 64bit, Firefox
3. Screenshot