Runtime error 70 'Premission Denied'

Hey i have made a program that automatically presses F1 every 3 sec's
its for a game but when i try to use it it says
Runtime error 70 'Premission Denied'
In other aplications it's working really well

I just use

sendkeys ("{F1}")

IS there a way to prevent this?

What are you sending to?

to a game ^^

We don't support flooding/cheating at games.

is it cheating?
else i need to press F1 all day long!

Is this an Online Game?

no its not an online game