Nivo Slider not showing at all

Hi,

Hopefully I’ve put this in the right section but please let me know if its not.

On one of my client sites for some reason the nivo slider has gone missing. I can’t for the life of me work out why though! I’ve only made basic content changes so I’m not sure why its stopped working.

The URL is: https://www.bedehouse.org.uk/ and the slider is on the homepage.