If UI erros appear they tell you the name of the addon they relate to (there is a patch like user/addons/<addonName>) and you should write the error message to the <addoName> comments.
Are you sure you have updated ALL addons and are not using any outdated or discontinued ones? Maybe they need a fix or in the comments of these addons you'll find additional information.
UI errors could always happen especially within days or weeks after bigegr patches like yesterday. Here is how to report a bug to teh devs of that addon:
https://www.esoui.com/forums/showthread.php?t=8858