lua error when following the tutorial on wiki

[zeox]

hello good people, I get the following error when writing the exact same code as here (the first part):
"attempt to index a nil value"

this is on the fourth line, which is this one:
MyFirstAddonCounter:SetText(string.format("Counter: %d", counter))

why is this? the counter variable is clearly initialized as 1 :S

This is my first time fiddling with lua, so I would appreciate any help here!
thanks

[Wukar]

nil means nothing or not set at all where an integer is expected. You missed something

[Gillymead]

If you're still having this issue Zeox can you post both the LUA code and the XML you have?