ICal Caldav errors after upgrade to Lion

Question

Dear all,
I had a perfect working setup (MacBook Air) with Snow Leopard, iCal accessing my agenda via caldav to zimbra mailserver.
Upgraded to Lion (10.7.2) and since then iCal does not sync correctly anymore:
1. events created on my mba do not end up on the server
2. event invites by other people or events created via the zimbra webinterfaces do not always end up in iCal
I've deleted and (re)created the account multiple times, erased caching and other directories in between, no change.
Configured the same account on a colleague's mac book pro also with Lion upgrade, everything working fine....
Error I get from iCal (Version 5.0.1 (1547.4))
The request (CalDAVAccountRefreshQueueableOperation) for account "webmail.mydomain.com" failed.
From syslog:
Nov 17 12:07:36 My-Name-MacBook-Air iCal[461]: Account refresh failed with error: Error Domain=CoreDAVErrorDomain Code=3 "The operation couldn't be completed. (CoreDAVErrorDomain error 3.)" UserInfo=0x7f99edd356c0 {AccountName=webmail.mydomain.com, CalDAVErrFromRefresh=YES}
From console log:13/12/11 21:05:27,212 iCal: CoreData: error: (1) I/O error for database at /Users/stevenkrekels/Library/Calendars/Calendar Cache.  SQLite error code:1, 'Expression tree is too large (maximum depth 1000)'
13/12/11 21:05:27,238 iCal: *** -[CalManagedObjectContext executeFetchRequest:error:]: error: Error Domain=NSCocoaErrorDomain Code=256 "The file “Calendar Cache” couldn’t be opened." UserInfo=0x7fe1b6080f60 {NSFilePath=/Users/stevenkrekels/Library/Calendars/Calendar Cache, NSSQLiteErrorDomain=1, NSUnderlyingException=I/O error for database at /Users/stevenkrekels/Library/Calendars/Calendar Cache.  SQLite error code:1, 'Expression tree is too large (maximum depth 1000)'} {
    NSFilePath = "/Users/stevenkrekels/Library/Calendars/Calendar Cache";
    NSSQLiteErrorDomain = 1;
    NSUnderlyingException = "I/O error for database at /Users/stevenkrekels/Library/Calendars/Calendar Cache.  SQLite error code:1, 'Expression tree is too large (maximum depth 1000)'";

Answer 1

I forgot to mention that any help would be much appreciated