Starting MPlab and PIC ( Problems)

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#include <p18f4520.h>
#include <delays.h>
 
#define _XTAL_FREQ 10000000
 
//LCD (PortD)
#define  E            LATDbits.LATD6
#define  R_W       LATDbits.LATD5 
#define  RS          LATDbits.LATD4
#define  LCDdata LATD
 
void command(unsigned char);
void write(unsigned char);
void Nybble(unsigned char);
void init(void);
void PutMessage(rom char *);
 
void main()
{
    while(!OSCCONbits.IOFS);      //wait for osc stable
    ADCON1 = 0x0F;                //make RA0 digital
 
    //data direction registers all 0's mean that all pins are set to output
    //all 1's means that all of the pins are set to operate as inputs
    TRISA = 0x00;  
    TRISB = 0x00; 
    TRISD = 0x00;
        init();
        PutMessage("Hello World!");
        command(0xc0);
        PutMessage("WELCOME");
        while(1);
}
 
//Write a string to the LCD
void PutMessage(rom char *Message)
{
    rom char *Pos = Message;
    while(*Pos!=0)
        write(*Pos++);
}
 
/**********************************************************/
//4-bit methods for LCD
/**********************************************************/
void command(unsigned char i)
{
    RS =0;
    R_W =0;          //R/W=LOW : Write
    Nybble(i>>4);    //Send upper 4 bits
    Nybble(i);       //Send lower 4 bits
    Delay1KTCYx(2);  //must wait at least 2mS (2*1000*4/1e6 = 8ms used)
}
 
void write(unsigned char i)
{
    RS =1;
    R_W =0;          //R/W=LOW : Write
    Nybble(i>>4);    //Send upper 4 bits
    Nybble(i);       //Send lower 4 bits
    Delay1KTCYx(2);  //must wait 2mS
}
 
/**********************************************************/
void Nybble(unsigned char dat)
{
    dat &= 0x0f;             //clear top bits of dat
    LCDdata &= 0xf0;         //clear bottom bits of port (interested only in DB7-DB4)
    LCDdata |= dat;          //or the two and store at port
    E = 1;
    Delay1TCY();             //enable pulse width >= 300ns (used 4uS)
    E = 0;                   //Clock enable: falling edge
}
 
/**********************************************************/
void init(void)
{
    LCDdata=0x00; 
    Delay1KTCYx(15);    //Wait >15 msec after power is applied (used 20mS)
    Nybble(0x3);    //command 0x30 = Wake up
    Delay1KTCYx(5);     //must wait 160us, busy flag not available (used 160uS)
    Nybble(0x3);    //command 0x30 = Wake up #2
    Delay1KTCYx(5);     //must wait 160us, busy flag not available (used 160uS) 
 
    command(0x20);      //Function set: 4-bit/2-line
    command(0x2c);      //Function set: 4-bit/2-line
    command(0x10);      //Set cursor
    command(0x01);      //Clear Display (Added)
    command(0x06);      //Entry Mode set
    command(0x0c);
}
/**********************************************************/
//End methods for LCD
/**********************************************************/