The following error message was repeated several times in Console on my aging G4 iMac running Leopard 10.5.8:

7/8/11 9:31:22 PM com.apple.AppleFileServer[8123] MDSChannelPeerCreate: (os/kern) invalid argument

This error appears to be related to permissions of “.feseventsd” located on the root directory of your boot drive. To fix it, quit file sharing by unselecting it in the “Sharing” preference pane, fire up “Terminal.app”, and enter the following at the prompt:

www-schwie-com:/ brad$ sudo chown -R root:staff .fseventsd
Password:
www-schwie-com:/ brad$ sudo chmod -R 770 .fseventsd

After these changes are made to the .fseventsd file, go back to System Preferences and turn file sharing back on under “Sharing”.