Traveler Error 39

Anyone any idea, why this error occurs? I configured a XDA Neo and everything works fine for 2 days. Earlier this morning, travel(l)er stops syncing. I tried to reconfigure the device, but I only receive this error(39) on uploading the device data to the server.

Every fixpack available for travel(l)er already is installed.

And yes, I know, I should not use a weapon of mass destruction! But I do not have enough money for an iPhone 🙂