Uploading Problem w/ Programming APM2.5 using Arduino IDE

I am having problems programming an AMP2.5 using the ArduPilot-Arduino-1.0.3-gcc-4.8.2-windows IDE that I downloaded from the DIY Drone web site:

http://firmware.diydrones.com/Tools/Arduino/

I have followed the instructions "How to Build ArduPilot with

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