Apple Internet Sharing errors

I noticed these strange errors in my log, on the MacBook Pro:

com.apple.launchd[1] (com.apple.InternetSharing) Throttling respawn: Will start in 10 seconds

And every 10 seconds or so, the error would show up again.  This meant, that every 10 seconds, launchd was trying to do something, and failing.  After looking through some support forums, finding no answers, I decided to go take a look at Internet Sharing in more detail.  Might I add, I have never used InternetSharing on my MacBook Pro.  I use it on the iMac at home, for all devices in the house, but not the MBP.  As I thought, the Internet Sharing was not turned on, nor was there evidence that it had been used at some point.  I decided to enable it, using the AirPort as the shared resource, and the Ehternet as the device for the NAT.  It complained that the AirPort was not turned on, but after a moment, it gave up and said it was sharing.  Lots of errors in the error log, but I expected that.  I then turned off Internet Sharing, and returned to Console to watch the logs.  To my surprise, the respawn errors stopped.  Knowing that nothing is always what it seems, I rebooted, just to ensure the problem did not reappear on a restart, which it didn’t.