from 877 to 452

[Automan]

HI all

"I've got a problem!", i wrote a piece of code for the 16F877 which works fine but i haven't enough memory to continue.
So i have decided to move it to 18F452 but it doesn't start.

crystal is actualy a 4MHz

I use :
-microcode studio 2.1.0.6
-PBP 2.45
-mpasmwin v03.80.03
-labtool 48 universal programmer

I have no error report

here is the beginning of my code

can someone help me i don't understand what's wrong.