Could you please update the application with a setting to automatically recognize the processors?!
It does automatically recognise the processors on my machine, that was why I suggested that there might be a bug and also made the observation that there were a lot of search hits for your error message.
Have you tried removing the following lines from conky.conf:
CPU 1: ${cpu cpu2}% ${cpubar cpu2 4}
CPU 2: ${cpu cpu3}% ${cpubar cpu3 4}
CPU 3: ${cpu cpu4}% ${cpubar cpu4 4}$color