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An issue with your theme probably, have you tried deactivating your plugins and switching to the TwentyFifteen theme to narrow this down?

Something’s throwing the same error as outlined here: https://wordpress.org/support/topic/read-this-first-wordpress-45-master-list?replies=7&view=all#post-8268201

Divi
Divi Version 2.7.3 ( updated 04-13-2016 ) fixes the jQuery issue outlined below. Update your theme.
Exhibits the jQuery problem as described…