Slider stopped working

I use Travelify theme and its really convenient.
But some days ago slider stoped working. I tested all the options that could be found in the instructions. Nothing helped.
I thought that the problem may be related to the plugin “Page Links To”.
Turn it off. But the slider does not work anyway.
Please help.

Your footer is completely messed up. Make sure to revert all changes done in the theme files. If it doesn’t help, just reinstall the entire theme. All changes done via WordPress customizer or Theme Options will remain in place even after the reinstall.