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local sGameRunning

on updateScreen

if sGameRunning then

if the mouse is not down then
set the top of image "myrocket" to the top of image "myrocket" + 10
end if

end if

end updateScreen

on StartGame
activateScreenUpdates

put true into sGameRunning
end StartGame

on stopGame
put ...

I have been watching the Game Academy videos, and when I run script that makes the rocket fall, about 30 minutes in, it has an error that reads:
card id 1002: execution error at line 16 (Handler: can't find handler) near "activateScreenUpdates", char 1

I have done everything I have been told to do ...