I've been getting this error during boot, although, it does not seem to be causing any problems. I've been using a Logitech M570 wireless trackball for quite a while and it has only started appearing since the last kernel update (3.16-2).
The error: kernel: logitech-djreceiver 0003:046D:C52B.0003: logi_dj_raw_event: invalid device index:255
The device: Bus 011 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Has anyone else seen this, or, has something changed in the kernel? The only difference I've seen is with the KDE battery monitor. It's reading 100% for the trackball, and, I do believe the last time I looked, it was at 93%.