Gtkpod - unable to transfer mp3 to iPod touch

[dovah]

Hello community! ^^

I was trying to tranfer some mp3 files using GtkPod to my iPod touch (model: MC540BT/A version: 6.1.3 10B329) using ubuntu 12.04 but tranfer failed even though this model should be formally supported... I already tried with Banshee and Rhytmbox, unsuccesfully...

I'll post the errors given back by the program:
https://www.dropbox.com/s/2makr5uo0e...%3A49%3A22.png
https://www.dropbox.com/s/6u1ng2s7ym...%3A50%3A05.png

Did someone already tried to transfer his mp3 files to an iDevice successfully?
Hope you will provide a solution! Otherwise, I see no other solution than jailbreaking my iPod!

Thank you

[dovah]

Anyone?