XML errors might appear after an addon has been disabeled

[zgrssd]

While testing on the EU client just about now, I noticed an odd bug - if a lua error would result in the XML running into a nil argument exception, that exception message will appear in the reload after the Addon has already been disabeled.

Wrote a more detailed bug report over in the ESO Forums, with code to reproduce and all:
http://forums.elderscrollsonline.com...n-is-disabeled

[Xrystal]

I have noticed this as well. I thought it was just something I was doing wrong when no one else mentioned anything about it. Maybe it is to do with how their reloadui works.

[lyravega]

I'd be careful. I was messing around and created a ghost chat window, which kept giving me errors all over the place till I learned about the destroyContainer() function :P

[stjobe]

On a possibly related note: If you have errors in your lua code, the game may throw errors even if that code never runs.

I had a faulty lua statement in SorcererHelper that threw errors on loading a non-sorcerer character, even though this code is the first that runs for the addon:

local function OnAddOnLoaded(eventCode, addOnName)
    if (addOnName == "SorcererHelper") then
        if GetUnitClassId("player") ~= 2 then
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_ADD_ON_LOADED)
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_PLAYER_ACTIVATED)
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_ACTION_SLOT_ABILITY_SLOTTED)
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_ACTIVE_WEAPON_PAIR_CHANGED)
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_UNIT_ATTRIBUTE_VISUAL_ADDED)
            EVENT_MANAGER:UnregisterForEvent("SorcererHelper", EVENT_UNIT_ATTRIBUTE_VISUAL_REMOVED)
            do return end
        else
            SH.SV = ZO_SavedVars:NewAccountWide("SorcererHelper_SavedVariables", 1, nil, SH.Defaults)
            SH.CreateSettings()
        end
    end
end

That "if GetUnitClassId("player") ~= 2" means that unless your character is a sorcerer, the addon will unregister all events and stop.

Even so, a bug in a function in code that never ran threw an "attempt to index a nil value" error. It stumped me for a while until I realized that it's a compile-time error.

I'm guessing the game loads and compiles all code during loading/reloading, and the bug I had gave a compile-time error - which was why it showed up even though the code itself never got called.

[Seerah]

I haven't checked, but is GetUnitClassId() not available to call in the main chunk of your addon?

[Xrystal]

I would suspect anything Player related would not be accessible until the player is first activated.

[stjobe]

Originally Posted by Seerah I haven't checked, but is GetUnitClassId() not available to call in the main chunk of your addon?

Originally Posted by Xrystal I would suspect anything Player related would not be accessible until the player is first activated.

GetUnitClassId("player") can be called before EVENT_PLAYER_ACTIVATED, it works just fine. The function above runs on EVENT_ADD_ON_LOADED, but I also have several other initialization methods that run on EVENT_PLAYER_ACTIVATED.

I was merely suggesting that since the Lua code is compiled (and can therefore throw compile-time errors), perhaps something similar happens with the XML files for an addon - even if it is disabled.