Probe to read quadrature encoder with DT_INT need help

[phoenix_1]

@ __config & _WDT_ON & _PWRTE_OFF & _BODEN_ON & _LVP_OFF & _CP_OFF & _DATA_CP_OFF
'@ Device pic16F877, HS_OSC, BOD_ON, PWRT_OFF, WDT_ON, PROTECT_OFF
    Define osc 20
    DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
    DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
    DEFINE HSER_SPBRG 64  ' 19200 Baud @ 20MHz, 0.16%
    DEFINE HSER_CLROERR 1 ' Clear overflow automatically
    ADCON1 = 7
    old_val VAR BYTE
	new_val VAR BYTE
	direction_bit VAR BIT
	enc_counter VAR WORD
    enc_counter = 10000
	new_val = PORTB & %00000011
    TRISB = %00000011
    INCLUDE "DT_INTS-14.bas"     ' Base Interrupt System
    INCLUDE "ReEnterPBP.bas"     ' Include if using PBP interrupts
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RBC_INT,         _LED,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor

 ENDASM
@   INT_ENABLE   INT_INT     ; enable external (INT) interrupts
    rs232:
    pause 1     
    goto rs232
    
    LED:
    
	old_val = new_val

	new_val = PORTB & %00000011
	
	IF new_val = old_val Then again

	direction_bit = old_val.bit0 ^ new_val.bit1
	
	IF direction_bit = 1 Then  
	
			enc_counter = enc_counter + 1
		
	else
		
		enc_counter = enc_counter - 1
		endif
		hserout [dec enc_counter]
	again:
@ INT_RETURN

PBP 2.47 , 250 or 250C in all version same errors ???

can you edit and post my code full please sir?