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

I'm trying to program my ATTiny45 with an Arduino Mega 2560. The Arduino is flashed with the ISP. I have verbose uploading turned on and this is what I get:

avrdude: Version 5.11, compiled on Sep 2 2011 at 19:38:36
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2009 Joerg Wunsch

System wide configuration file is "C:\Arduino\hardware/tools/avr/etc/avrdude.conf"

Using Port : usb
Using Programmer : stk500v2
avrdude: usbdev_open(): did not find any USB device "usb"

Oh yeah, and I've tried rebooting.

You should be using programmer "Arduino as ISP" and set the serial port to the one going to the Arduino.

johnwasser:
You should be using programmer "Arduino as ISP" and set the serial port to the one going to the Arduino.

This solved it. I feel so stupid!

Thank you so much!