WoWInterface - Need help with lua error

Anyone know about coroutines in Lua?

Here is the setup. I am working on an Addon to capture a screenshot when you level up. I got that part working however, the screenshot does not show the golden sparks. So I need to delay the screenshot for a second or two.

I tried the following code to delay the screenshot:

Code:

  local sstime;

  sstime = time();

  sstime = (sstime + x);                

  repeat

                                                        

  until sstime < time()                                

  Screenshot();

The result of this was the game would "freeze" for however many seconds you set (x) and then take the screenshot at the same point.

So I read up and I am trying to use coroutines as a way to "thread" the timer. I have the following code in my Lua:

Code:

local cr = coroutine.create(function(x)        

                local sstime;

                sstime = time();

                sstime = (sstime + x);                

                repeat

                                                        

                until sstime < time()                                

                Screenshot();



        

                coroutine.yield(x);

        end

end)



function dingrecorder_Onevent(event)

        DEFAULT_CHAT_FRAME:AddMessage("/g Ding " .. arg1);

        



        if (event == "PLAYER_LEVEL_UP") then 



                if (arg1 ~= nil) then 

                        coroutine.resume(cr,2); 

                end

        end



        

end

and upon start I get the error:

Quote:

Interface\Addons\DingRecorder\Dingrecorder.lua:1: attempt to index global 'coroutine' (a nil value)

any ideas?

thanks in advance!