Comment 4 for bug 2069006

I stumbled upon this same issue, however I did not transfer the entire KOReader install to my new ereader, just the books folder and the settings files. I also tried deleting the books folder (and metadata file) and moving the books over fresh and still came to this error again, so it must be an issue with a setting in the settings files.

Is this error coming from Calibre itself, or the wireless driver? It sounds to me like it might be a mismatch between the UUID that's being reported by KOReader and the driver? If so, that seems like something that could be corrected with a prompt and being asked if you'd like to overwrite it with the correct value.