MOV DPP, 0000h ;
MOV DPH, 0000h ;setting data pointer
MOV DPL, 0000h ;

MOV DPP, 0000h ;
What is DPP? if it is a derivative special, please have the courtesy to specify the derivative

MOV DPH, #0000h ;setting data pointer
MOV DPL, #0000h ;
should take care of your problem

Erik