Need help with lua error

[thejoester]

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:

   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:

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:

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

any ideas?

thanks in advance!