Question Script not opening door

Here is the error I get with the following code:

1) Name : Death Trigger
2) Intended for : Mobiles
3) Trigger types: Death
4) Numeric Arg : 100
5) Arguments :
6) Commands:
attach 903 %self.room%

[ Trigger: Death Trigger, VNum 909. attach invalid id arg: 'attach 903 }1050927' ]

Try using the other type i wrote about

attach 903 %self.room.id%

Works like a charm, thought i tried that already but guess not.
One thing I noticed is I may need to purge the death trigger after the zone resets because it still seems to override the mob prevent code after the zone resets

Alright, I was able to get this working with a few minor tweaks had to create a detach trigger as well so that it works once the zone resets the mob will go back to blocking the lever - Thank you!