Plugin no longer working

Hello –
I’ve used this plugin for a couple of years and it’s just stopped working on existing sites. The changes I make to existing sidebars and new sidebars are not showing up on the live site.
The websites are the-cooking-studio.com and holisticyogaschool.com.

Thanks,
Gretchen

https://ww.wp.xz.cn/plugins/easy-custom-sidebars/