cant set my code

I can’t set my code; I simply get the ‘ERROR’ message on the screen. Why is this?
To set the code successfully, press the ‘ENTER’ key and ‘3’ simultaneously. It is easiest to first press and hold down the ‘ENTER’ button then press ‘3’ with your other hand. The ’SET CODE’ message will appear on the LCD

I can’t set my code; I simply get the ‘ERROR’ message on the screen. Why is this?
To set the code successfully, press the ‘ENTER’ key and ‘3’ simultaneously. It is easiest to first press and hold down the ‘ENTER’ button then press ‘3’ with your other hand. The ’SET CODE’ message will appear on the LCD