How to solve import failed red x mark?

I tried importing 10,000 images to IPFS via desktop app.
I managed to import 7500 images without any problem (it got green checkmark) BUT when I tried to import the next images (7501~) it failed and shows red x mark
The importing percentage is also looking weird, it showed 10% and then several seconds later it jumped to 100%, and failed

Does anyone know how to fix this?