Slider doesn't work with Kelly theme

Hello all,
I noticed problem with slider and theme Kelly. When I activate this theme, and try try use slider, no any picture is shown, only empty, white box, or wait icon if it enabled.
When I deactivate Kelly theme and use another all working fine.
How can I correct problem ?
Here is page address:
mariolazawada.pl/www

Regards,

https://wordpress.org/plugins/slider-image/