remove the module before uploading.
I am working with the same board, and i have this problem too.I bought Arduino+Xbee board last week. When I tried to upload a example, this message appeared:avrdude: stk500_getsync(): not in sync: resp=0x00avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51I saw the recommendations in Arduino website but I can´t solve it.Some information about my enviroment:OS: Windows XPSerial Port: COM3Board: Arduino Duemilanove + XBee (Squidbee)I am new in Arduino.I need your help. Thanks!
i want to solve this problem as soon as possible.