"Invalid PS2 game"

I have a fat PS2 and a slide tool swap magic 3.6 and a backup of my KHIIFM+ which broke.I am using the DVD SM disk. After I use my slide tool to put in Kingdom Hearts it says its not a valid PS2 game when I try normal boot or special boot. Can anyone tell me If Im doing something wrong?

 

Are you still using the broken KH2FM CD or something? And what are the damages? Scratches or cuts?

 

Using the backup. PS2-3001 Verbatem DVD-R. No scratches or cuts or anything

 

I've heard that it doesn't like to use non-Sony DVD-Rs. That's all the help I can be unfortunately.

 

Uh... did you copy from ISO or from the disc itself using copying software?