Pages not loading due to error since update

One of the last updates include a error loading my pages. The page keeps on loading and doesn’t show. About 90% of the pages have this error. Can this problem be solved? I realy like this plugin and I want to keep it using.

JQMIGRATE: Migrate is installed, version 1.4.1
profile-magic-public.js:2 Uncaught TypeError: $(…).datepicker is not a function
at HTMLDocument.<anonymous> (profile-magic-public.js:2)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at Function.ready (jquery.js:2)
at HTMLDocument.K (jquery.js:2)

I can provide you a admin site login, if needed.

Kind regards,

The page I need help with: [log in to see the link]