Can't save project with PNG objects

Hello!

I created a very short animation to test Toon Boom Studio. I used only objects in PNG format. I didn’t have any problems while editing the images. However, when I try to export the animation, Toon Boom takes a lot of time to complete only 5% and my notebook starts to get really hot. When it achieves 14%, the process stops and the animation is not saved.

Do I have to convert the images to another format and then work in the animation?

The configuration of my notebook:

Intel(R) Core™ i7 CPU Q 740 @ 1.73GHz
6,00 GB RAM
NVIDIA GeForce GT 335M

CAN ANYONE HELP ME??

Hmmm… PNG should work fine… what are your image resolution and length of project…?
Try a shorter sequence… (select only a few images)… does that work…?

Regards
Nolan