Bom eu to com o seguinte erro na hora do spawn dos zombies

[19/12/2011 19:27:20] [Error - GlobalEvent Interface]

[19/12/2011 19:27:20] In a timer event called from:

[19/12/2011 19:27:20] data/globalevents/scripts/zombie.lua:onTimer

[19/12/2011 19:27:20] Description:

[19/12/2011 19:27:20] data/globalevents/scripts/zombie.lua:71: bad argument #2 to 'random' (interval is empty)

[19/12/2011 19:27:20] stack traceback:

[19/12/2011 19:27:20] [C]: in function 'random'

[19/12/2011 19:27:20] data/globalevents/scripts/zombie.lua:71: in function <data/globalevents/scripts/zombie.lua:69>

se alguem poder me ajudar ganha rep+