This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Perhaps you are looking in the wrong place for those log files? I don't see anything wrong with what you posted, and it says to write the logs into the /logs folder. So do you have such a folder? Does your server have permission to write in it and create files in it?