Error with an Item Show script

[Foghart]

Hello there, how are ya?
I have two scripts in my game, one is the Particle Script and the other is an Item Show script.
The problem is this:

http://img818.imageshack.us/i/gameerror01.png/
On this image, you can see that its a normal map with the Particle Script working as a simple light.
But when I get an item from that chest, another script shows a box with the message "You gain... Item X" for example.
Thats the problem, when the Particle Script is in the same map as the box appears, shows this error:
http://img130.imageshack.us/i/gameerror02.png/

Anyone knows how to make the script work correctly?
The scripts is attached.
I'm brazzilian, so I don't speak english very well.
Seeya, waiting for help and till next time!