Calendar disappeared with update

Hey there,

I upgraded to the latest version buy my calendar disappeared from the front end and also when I was logged in. I tried deactivating a few plugins but didn’t seem to help. Any ideas?

I’ve updated all the addons that I have as well and I now have the calendar back in the front end, but can’t access anything on the backend, I can’t edit calendar, the calendar doesn’t show on the booking forms page, and when I try to order for a customer I click add new and nothing happens. Here’s the error that comes up in console

Uncaught TypeError: Cannot read property ‘fullcalendar_locale’ of null
at bookacti_select2_init (global-functions.min.js?ver=1.8.2:1)
at HTMLDocument.<anonymous> (global-functions.min.js?ver=1.8.2:1)
at i (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.4.1:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.4.1:2)
at Function.ready (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.4.1:2)
at HTMLDocument.J (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils&ver=5.4.1:2)

I disabled all plugins and went to default theme, added wp_debug but nothing was reported.