atmega2560 and atmel-ice gives no answer from target

[zskdan]

Hello, I'm getting:
initJtagBox() failed: no answer from target when trying to use avarice (master branch) on an atmel-ICE with a atmega2560 (arduino mega 2560 board). Am I missing something ?
The complete log is here

Although avrdude is working great on the same board.

avrdude -v -patmega2560 -c atmelice_isp -U lfuse:r:-:i
...
avrdude: safemode: lfuse reads as FF
avrdude: safemode: hfuse reads as 18
avrdude: safemode: efuse reads as FD
avrdude: safemode: Fuses OK (E:FD, H:18, L:FF)

avrdude done.  Thank you.