I haven't added events but am getting "This calendar is unreadable. No events have been added to your iCal calendar"

I recently started getting the message "This calendar is unreadable. No events have been added to your iCal calendar".  However, I typically add my events by typing them myself either on my MacBook Pro or my iPhone. I don't import from outside sources. I don't know if it's related or just coincidental that around the same time, events that I add to my MacBook Pro are not syncing to my iPhone, but the events added by iPhone seem to appear on my MacBook Pro and my MiniMac.  Is there a way to find the event that is being referenced in this error message??

iPhone:
Plug in your iPhone
Go to iTunes > Your iPhone > Info and ensure that calendars is not checked off to sync -- if you are using MobileMe to sync, this option should not be checked
On both Macs:
1.) Go to Apple > System Preferences > MobileMe > Sync and remove the check Mark for calendars.  With the new MobileMe calendar system there is no need to have this checked.  Close the MobileMe window once this is complete.
2.) Open iCal and then go to iCal > Preferences > Accounts and remove the MobileMe account from here with the minus sign.
3.) Go to iCal > Quit iCal
4.) Remove the following to the trash and restart your computer:
Home > Library > Caches > com.apple.ical
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache if present)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)
5.) Open iCal and go to iCal > Preferences > Accounts
-- If the MobileMe Account is already here remove it again and then re-add it being very careful to use the correct name and password (for your 10.5 system follow these steps for re-adding: http://support.apple.com/kb/HT4330)
-- If the MobileMe account is not already here, add it in.
iCal will download your calendars from the MobileMe server.  Watch and see if you get the error message.  If it completes the download (little spinning gear stops spinning next to the MobileMe calendar) go ahead and add a new uniquely named event to one of your MobileMe calendars on both computers and see if it syncs between.
Let us know what happens.

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