Hi Corey,

--On August 19, 2009 7:17:57 AM -0700 Corey Scobie <corey@scobie.com> wrote:

macmini:~ cscobie$ ls -al

/Library/CalendarServer/twistedcaldav/test/data/calendars/__uids__/ks/co/

kscobie

total 0

drwxr-x---@  6 cscobie  admin   204 Dec 30  2008 .

drwxr-x---   3 cscobie  admin   102 Oct 28  2008 ..

drwxr-x---@ 40 cscobie  admin  1360 Jul  6 22:45

252430BC-1F8D-45E2-BB8D-0DAA07F6D326

drwxr-x---@  8 cscobie  admin   272 Aug 18 13:48

AA17990F-4523-4F07-872F-739734CCCBB5

drwxr-x---@  3 cscobie  admin   102 Jul 13 20:28 inbox

drwxr-x---@  2 cscobie  admin    68 Dec 15  2008 outbox

... and the extended attributes listing...

OK, so your client tried to access a "calendar" directory in that location and as you can see it does not exist. What client are you using? If it is iCal, try removing then re-adding the account for that server.

--
Cyrus Daboo