upload error to mega adk from eclipse (stk500v2_command(): command failed)

hello, i have upload problem for mega adk by eclipse

before use uno board work well at eclipse.

but after try mega adk board with eclipse cant upload
(in arduino IDE can upload, but i want use eclipse)

until build work well in eclipse but when i try upload, eclipse send error msg

stk500v2_command(): command failed

i try search a lot of time by google but still cant find why ...

my code was empty

please share of your experience

#include "ZtestMega.h"
void setup(){}
void loop(){}
Launching F:\arduinoProject32Bit\arduino-1.0.5-r2\hardware\tools\avr\bin\avrdude -patmega2560 -cwiring "-P\\.\COM4" -b115200 -Uflash:w:ZtestMega.hex:a "-CF:\arduinoProject32Bit\arduino-1.0.5-r2\hardware\tools\avr\etc\avrdude.conf" 
Output:

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9801
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: stk500v2_command(): command failed

avrdude done.  Thank you.

avrdude finished