Add Media Button does not work

Hi,

Currently having an issue with the Add Media button on the Add Event page in the WordPress back-end. When you click it, nothing happens. Here is what I’ve tried:

1) disabling all plugins except events manager

2) switching themes

3) resetting plugins folder

4) adding define(‘CONCATENATE_SCRIPTS’, false ); in wp-config

The add event page returns the following javascript error:

TypeError: jQuery(...).autocomplete(...).data(...) is undefined
https://[mywebsite].org/wp-content/plugins/events-manager/includes/js/events-manager.js?ver=3.8.1
Line 569

I do believe this happened upon upgrading to EM version 5.4.3. Also using EM pro version 2.2.5. WP version is 3.8.1

also: add gravity forms button doesn’t work as well.

https://www.ads-software.com/plugins/events-manager/