Slidercontrol doesn’t export properly in json file

Hi,

I am experiencing difficulties with my animation I created in after effects. It’s a very simple animation and it just has 3 numbers with a slidercontrol effect on them. It works perfectly in AE but when I want to export my animation in Bodymovin to create a json file, something goes wrong. When i double check the json file export in Lottie, the slidercontrol effects are non existent. The numbers just stay on '0'. When i export in AE - Bodymovin I have already included these extra properties:
- Assets --> include in json 
- Advanced export settings --> include non supported properties 

Normally this combination works for me but somehow it just doesn’t seem to work. Does anybody know what I am doing wrong?

Sincerely, 
Estelle