Addon Tutorial, got it to work, changed something, now I can't make it work again.

[Sharp]

<TopLevelControl name="MyFirstAddon" mouseEnabled="true">

If you change the name here, you'll need to change it in the LUA because of this code here also in the XML

 <Label name="$(parent)Counter" font="ZoFontWindowTitle" color="CFDCBD" wrapMode="ELLIPSIS" verticalAlignment="CENTER" text="Counter: ">

$(parent)Counder means it will evaluate to MyFirstAddonCounter

And you have to change the LUA here:

MyFirstAddonCounter:SetText(string.format("Counter: %d", counter))

If you change it from MyFirstAddon, you'll need to replace all instances where it was. Once you change those, it should work.