Sync problem caused by birthday calendar

I can't sync between my iPhone 3G and my Powerbook anymore.
Looking into the log, the problem seems to be coming from a problem with a birthday calendar (please see log at the bottom of this post).
I have a clue, how the problem might have been created:
I installed the "2do" app on the iPhone and synced it successfully many times (vie WLAN). Also, syncing my address book and calendar was no problem. Then suddenly in my iCal a second "Birthday" category popped up. The first one was the subscription from the birthdays in my address book. The (new) second birthday category was identical and duplicated my birthdays in iCal, so I erased one of the two (I don't remember which one).
Since about this time, no syncing is possible. I tried to erase the sync-history in iSync, but it didn't help.
Does anyone know how to resolve this problem/conflict?
I would be happy if someone told me how to erase all calendar, address book and syncing data from my mac and to recall all data from my iPhone if that's a promising strategy...
Thanks in advance!
The LOG:
29.03.10 11:49:54 [0x0-0x20020].com.apple.iTunes[169] Child process initialized.
29.03.10 11:50:34 iCalExternalSync[176] [ICalExternalSync ]Encountered CoreData could not fulfill a fault for '0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1>' with userInfo {
NSAffectedObjectsErrorKey = (
<CalManagedBirthdayCalendar: 0x2267c00> (entity: BirthdayCalendar; id: 0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1> ; data: <fault>)
29.03.10 11:50:34 iCalExternalSync[176] [ICalExternalSync ]NSException name:NSObjectInaccessibleException reason:CoreData could not fulfill a fault for '0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1>'
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] 2010-03-29 11:50:34.685 iCalExternalSync[176:10b] [ICalExternalSync ]Encountered CoreData could not fulfill a fault for '0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1>' with userInfo {
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] NSAffectedObjectsErrorKey = (
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] <CalManagedBirthdayCalendar: 0x2267c00> (entity: BirthdayCalendar; id: 0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1> ; data: <fault>)
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] );
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] }
29.03.10 11:50:34 [0x0-0x21021].com.apple.iCal[174] 2010-03-29 11:50:34.693 iCalExternalSync[176:10b] [ICalExternalSync ]NSException name:NSObjectInaccessibleException reason:CoreData could not fulfill a fault for '0x1c105e0 <x-coredata://5BB4AE6D-8862-4D64-8D29-B2EC8DA1F8D4/BirthdayCalendar/p1>'

I'm interested in a good solution for this problem because I've got the same problem when using TimeLog and trying to creat a new task.
The possibility to restore the ical-calender into ical fails due the same message as sputnik6 posted above.
// Problem appears after update to 10.6.3 on MBP

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Message was edited by: COHagan

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