Semantic segmentation

I created a dataset for semantic segmentation model and the coco annotation file is empty, even the semantic segmentation masks files (png) are empty (black images). I used the polygon tool to make my annotations and I cant seem to get them in the export folder. Why is this happening? Also which models can I use to train for sematic segmentation, I tried U net and Mask RCNN which isnt working due to the empty files.

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