avrdude: usbdev_open(): did not find any USB device "usb" Error

Hi all,

I am using 'Arduino uno' and am trying to 'upload using programmer' one of the sample code, but getting the following error :avrdude: usbdev_open(): did not find any USB device "usb" i have set my com port properly, board to Arduiono UNO and programmer to AVRISP mk2