Usb Host shield,Arduino and Honeywell barcode scanner can not be communicated..

Using Arduino Programming Questions
1

Hi. I am using Honeywell barcode scanner for a automation project...I used a usb host sheild (sparkfun) too along with arduino uno.....But when i upload my code no outpot from scanner is coming. Even scanner laser light is also not available. Pls help to find flaws of mine. i used the bellow code.

#include <hid.h>                           //Add to Oleg Mazurov code to Bar Code Scanner
#include <hiduniversal.h>                  //Add to Oleg Mazurov code to Bar Code Scanner
#include <usbhub.h>

#include <avr/pgmspace.h>
#include <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <hidboot.h>
#define DISPLAY_WIDTH 16
 
USB     Usb;
USBHub     Hub(&Usb);                                          //I enable this line
HIDBoot<HID_PROTOCOL_KEYBOARD>    Keyboard(&Usb);
 
class KbdRptParser : public KeyboardReportParser
{
        void PrintKey(uint8_t mod, uint8_t key);             // Add this line to print character in ASCII
protected:
  virtual void OnKeyDown  (uint8_t mod, uint8_t key);
  virtual void OnKeyPressed(uint8_t key);
};
 
void KbdRptParser::OnKeyDown(uint8_t mod, uint8_t key)
{
    uint8_t c = OemToAscii(mod, key);
 
    if (c)
        OnKeyPressed(c);
}
 
/* what to do when symbol arrives */
void KbdRptParser::OnKeyPressed(uint8_t key)
{

    Serial.print( (char)key );      //Add char to print correct number in ASCII
};
 
KbdRptParser Prs;
 
void setup()
{
    Serial.begin( 115200 );
    Serial.println("Start");
 
    if (Usb.Init() == -1) {
        Serial.println("OSC did not start.");
    }
 
    Keyboard.SetReportParser(0, (HIDReportParser*)&Prs);        //Here I change  "Keyboard" for "Hid"

}
 
void loop()
{
  Usb.Task();
}