Problem with Arduino mega 2560 connection with the usb host shield.

Hello friends, I am using Arduino Mega 2560 with Usb Host Shield. I connected a pendrive with the host shield.The usbdesc code got uploaded but the serial monitor displays-- Start OSC did not start. But when i connected it to the Arduino Uno and uploaded the code, the serial monitor gives the desired output.

I need to connnect it to the arduino mega 2560. Kindly suggest me what should be done to get the desired output. Thank You.