C - PIC recording program 18F4550 via USB

At first, I'm a layman when it comes to programming. Because of this, I am developing quick and easy programs to improve my knowledge.

I have a development board for a PIC18F4550, with LEDs on the RB pins, some on the RD and RC. The buttons are on the RE pins.

BootloaderhasalreadybeenwrittentothisPIC,soI'musingUSB(whichisonthebottomofthecard)todotherecordingonthePC.WhenIgenerateacode(I'musingMPLABX),Iloadthe.hexintotherecorder,andwhenitreaches99%,therecorderprogramsimplystopsresponding,andcloses...

Isthereaprocedurethatismissingfortherecordingoftheprogram?Detail,whenIrecordaprogramdonebyacollegeprofessor,itworksnormally.AndIcouldnotfindanypartoftheprogramthatwouldchangetherecordingsetting,justthesameprogramminglogic...

BelowisthecodeIwrote.TheclockIamusingis48MHz,andtheexternaloscillatoris20MHz.

IhopeIhavebeenclear.Ahug!

#include <xc.h>
#include "config.h"

void configura_uc()
{
    //Configura botão do PORTE como entrada e LEDS como saída
    TRISB=0xFF;
    TRISC=0xFF;
    TRISD=0xFF;
    TRISE=0x00;
}
void main(void) {
    configura_uc();
    while (1)
    {
        if (PORTEbits.RE0 = 1)
        {
            PORTBbits.RB7 = 1;
            PORTBbits.RB6 = 1;
            PORTBbits.RB5 = 1;
            PORTBbits.RB4 = 1;
        }
        if (PORTEbits.RE1 = 1)
        {
            PORTBbits.RB3 = 1;
            PORTBbits.RB2 = 1;
            PORTBbits.RB1 = 1;
            PORTBbits.RB0 = 1;
        }
        if (PORTEbits.RE2 = 1)
        {
            PORTDbits.RD7 = 1;
            PORTDbits.RD6 = 1;
            PORTDbits.RD5 = 1;
            PORTDbits.RD4 = 1;   
        }
    }
    return;
}