not well-formed error and OnUpdate script not working. Help?

[Krainz]

This is the TOC:

UIMod.toc

## Interface: 40200
## Title: UI Modifier
## Notes: Modifies other addons that change the UI
## Author: Krainz
## Version: 1.0
 
core.xml
core.lua

core.lua

local addon, ns = ...
 
local f = CreateFrame("Frame")
 
 
f:RegisterEvent("PLAYER_ENTERING_WORLD")
f:RegisterEvent("PLAYER_LOGIN");
f:SetScript("OnEvent", function(self, event, ...)
    local garrisonType = C_Garrison.GetLandingPageGarrisonType()
    local covenantID = C_Covenants.GetActiveCovenantID()
    local gwbutton = GwGarrisonButton
    if event == "PLAYER_ENTERING_WORLD" then
        print("UIMOD: Hello! Hello " .. event);
        print(covenantID);
 
        if gwbutton then
            print("UIMOD Entering World: GW2 UI Garrison Button is shown. Hiding.");
            gwbutton:Hide();
        end
 
--      if not covenantID=0 or garrisonType=3 then
--          print("UIMOD: Covenant Chosen or Order Hall enabled.");
--          if gwbutton and gwbutton:IsShown() then
--              print("UIMOD: GW2 UI Garrison Button is shown. Hiding.");
--              gwbutton:Hide();
--          end
--      end
    elseif event == "PLAYER_LOGIN" then
        print("UIMOD: Hello! Hello " .. event);
        print(covenantID);
 
        if gwbutton then
            print("UIMOD Player Login: GW2 UI Garrison Button is shown. Hiding.");
            gwbutton:Hide();
        end
    end
end)
 
 
local UIMod_UpdateInterval = 1.0; -- How often the OnUpdate code will run (in seconds)
 
 
function UIMod_OnUpdate(self, elapsed)
    local gwbutton = GwGarrisonButton
  self.TimeSinceLastUpdate = self.TimeSinceLastUpdate + elapsed;
 
 
  if (self.TimeSinceLastUpdate > UIMod_UpdateInterval) then
    print("UIMOD OnUpdate");
        if gwbutton then
            print("UIMOD OnUpdate: GW2 UI Garrison Button is shown. Hiding.");
            gwbutton:Hide();
        end
    --
 
    self.TimeSinceLastUpdate = 0;
  end
end

core.xml

<Ui ...>
  <Frame ...>
    ...
    <Scripts>
      <OnLoad>self.TimeSinceLastUpdate = 0 </OnLoad>
      <OnUpdate function="UIMod_OnUpdate" />
    </Scripts>
  </Frame>
</Ui>

I get the following LUA error at login:

Message: Interface\AddOns\UIMod\core.xml(1): error: not well-formed (invalid token)
Time: Mon Dec 14 20:41:58 2020
Count: 3

I also get the following debug messages I set up to make sure each step is working as intended:

08:43:19 | UIMOD: Hello! Hello PLAYER_LOGIN
08:43:19 | 0
08:43:19 | UIMOD Player Login: GW2 UI Garrison Button is shown. Hiding.
08:43:23 | UIMOD: Hello! Hello PLAYER_ENTERING_WORLD
08:43:23 | 0
08:43:23 | UIMOD Entering World: GW2 UI Garrison Button is shown. Hiding.

What happens is: the button doesn't get hidden and the OnUpdate script doesn't seem to be running.

However, if I just type the following:

/script local gwgarrison=GwGarrisonButton if gwgarrison then gwgarrison:Hide(); end

Then the button is properly hidden. I noticed that, however, the GW2 UI addon later on makes the button reappear, which is why the OnUpdate function is important.

Any ideas to what I may be doing wrong?