its not a error its just a massive log spam, i was running the dash_reactor (orwhatsitcalled) program on a monitor that updates every 2 sec
http://pastebin.com/x419yEXC
it did the same when displaying only one sensor data
so it looks like it logs everything it does in the server log.
on a side note the server chrashed when i placed a sensor next to a redpower tube.