What Add-On Is Causing This UI Error?
 

This happens when destroying an item, has happened for more than a month now, don't know what add-on is causing it.

Could be lots of addons. Can you give us a list of addons your using.
Do you have any addons that destroy items? (even if the error occurs when YOUR manually doing it, could be a problem with their code).
Do you have any addons that add or remove things from the right click context menu? (When you right click on items the little menu that pops up).

It would be easiest to narrow it down if we knew what all addons your running.

Check your addon list in-game via the escape menu - uncheck the "allow out of data addons" box if it is checked. Your culprit may then show up red.

ESO has a continually changing API and as such, an addon which previously worked fine could now be malfunctioning due to a required API function no longer existing.

There could be also a remedy to this as there are addons which add compatability - specifically "addon compatability for update 6" by Garkin - which may solve your problem.

Failing this, try disabling all your addons and re-enabling them one-by-one until you find the one which is causing the error. Who knows, your help could help the developer to fix the problem.

If none of these locate your issue, it may indeed be a corrupt game installation - in the launcher, click Game Options > Repair and see if this solves the issue. This is unlikely though as all lua files are located in your Documents folder, mainly from addons.



Something that also may help, go to My Documents/Elder Scrolls Online/live/Logs/

Open Interface.log in notepad and post the contents here. It may contain more information than what the game shows you. It could show something like this which would directly identify the addon causing the problem:

user:/AddOns/Teleporter/libs/List.lua:577: in function 'ListView:add_messages'


There are many people who have posted similar errors as yours but none have yet had a solution - often the threads die out before a solution is found.

Some addon probably modifies inventory context menu - function menuControl.OnSelect() or function ZO_Menu_ClickItem(control, button).
However without list of addons you use I dont have any idea which one could cause this issue.