yun initialization failed rc=-1

i just bought an arduino yun, i trying to upload a sample program in it using .
i always have this message even with an empty programme

avrdude: AVR device not responding
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.

using com pot it works well,

i am using 1.6.5 ide and i set my yun with the last firmware openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin

i can connect easly to the yun html page by wifi or ethernet,

by impossible to upload a program by wifi or ethernet, only direct com..

(excuse my poor English)

do you have any advise ?

I have the same problem just with a yun shield, so I would like to know as well. I feel like I have tried everything, but since it still ain't working i probably haven't.