Error occured can't figure out

#include<iostream>
#include<glut.h>
#include "Hero.h"
#include"RGBA.h"

AnimatedSprite *hero;
AnimatedSprite *bg,*fg;
int currentAnim;
float L=0,R=480;

void display()
{ 
   hero = new AnimatedSprite("alladin2.bmp",56,90,0,0,2001);
   hero -> colorKey(255,0,255);

   bg = new AnimatedSprite("BlueBkg2.bmp",760,480,L,R,2002);
   bg -> colorKey(255,255,255);

   glEnable(GL_ALPHA_TEST);
   glAlphaFunc(GL_EQUAL,GL_ONE);
   currentAnim=hero->currentAnimState;
   hero->drawSprite();
}

void UpdateSpriteAnimation(void)
{
   int currentAnim=hero->currentAnimState;
   hero->anim[currentAnim].currentFrames = (hero->anim[currentAnim].currentFrames++);
   if(hero->currentAnimState == hero->ANIM_WALK_LEFT)
   {
      if(hero->x >= L && hero->x <= R-10)
         hero->x -= 1.0;

      bg->anim[0].u -= 0.005;
      fg->anim[0].u -= 0.002;
   }

   if(hero->currentAnimState == hero->ANIM_WALK_RIGHT)
   {
      if(hero->x < R)
         hero->x += 1.0;

      bg->anim[0].u -= 0.005;
      fg->anim[0].u -= 0.002;
   }
}

void myTimer (int tt)
{
   UpdateSpriteAnimation();
   glutPostRedisplay();
   glutTimerFunc(hero->FRAME_DELAY_SPRITE,myTimer,0);
}

void main(int argc, char **argv)
{
   glutInit(&argc,argv);
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA | GLUT_DEPTH);
   glutInitWindowSize(640, 480);
   glutInitWindowPosition(10, 10);
   glutCreateWindow("Sprites Sheet");
  
   glutDisplayFunc(display);
   glutDisplayFunc(UpdateSpriteAnimation);

   // glutIdleFunc(display);
   glutTimerFunc(500,myTimer,1);
   glutMainLoop();
}