getting problem in code on hardware

#include<htc.h>


// PIC 18F452 fuse configuration:
// Config word 1 (Oscillator configuration)
// 40Mhz crystal input
__CONFIG(1, OSCSDIS & HSPLL);
// Config word 2
__CONFIG(2, BORDIS & PWRTDIS & WDTDIS);
// Config word 3
__CONFIG(3, CCP2RC1);
// Config word 4
__CONFIG(4, LVPDIS & STVREN);
// Config word 5, 6 and 7 (protection configuration)
__CONFIG(5, UNPROTECT);
__CONFIG(6, WRTEN);
__CONFIG(7, TRU);

#define _XTAL_FREQ 40000000   //MHz



void delay_sec(unsigned char seconds)    // This function provides delay in terms of seconds
{
    unsigned char i,j;

    for(i=0;i<seconds;i++)
    {
       for(j=0;j<100;j++)
        __delay_ms(10);
    }     
}

void main()
{
      
    TRISB = 0;   
    while(1)
    {
        LATB = 0xFF;   // ->  0101 0101
        delay_sec(1);   // delay of one second
        LATB = 0x00;    // ->  1010 1010   
        delay_sec(1);    // delay of one second
    }
}