Bug reproduced steps：
1. download a model from sketchfab website:https://sketchfab.com/3d-models/stylized-epic-bull-man-warrior-animated-c888523f5d5748799170e94e701987aa
2. open the accurig desktop software and upload the mode from sketchfab
3. Follow the rigged steps and when all of them are done, tap the export button and export my model with the settings from the screenshot I uploaded
4. an exceptional error occurred, please refer to the screenshot I uploaded.
5. I changed other models to try， but still cant export successfully

PS： the Issue system version is wrong and the correct version I uploaded is 2.1.0 not 1.0.