Random duplicate events when synching with Google

Hi,
I have just set up iCal for the first time and asked it to synch with my Google Calendar. Somewhere between the two systems I have had hundreds of duplicate events set up. The problem seems to only occur on recurring events. The new events are sprinkled liberally all over my calendar with no hint of when the original even was set up for. For example one event occurs at least twice a week from January 1920 onwards, in my original calendar this was set up as an annual recurring event only last year.
When I try to delete the events I am told the request has failed with the following message:
The server responded with
“HTTP/1.1 500 Server error code: 4bf55f72”
to operation CalDAVDeleteEntityQueueableOperation.
Also I frequently find the synching circle is running round and iCal just stops working i.e. can't enter new events or check my calendar.
Any advice gratefully received!
Jane

Hi Jane,
You are getting errors from the Google Server. This suggests there are issues with the data contained within Google and not in iCal so there may not be much we can do from here. I would be curious to know if you go to one of those recurring events on Google, does it have an end date or does it go on forever? Does it have a start date that is odd (you mention 1920...are you sure that you don't see a very early start date on Google.com?)
That said lets try some basics:
What version of the Mac OS are you running on your computer (Apple Menu > About this Mac)?
1. First make an iCal backup: Click on each calendar on the left hand side of iCal 1 at a time highlighting it's name and then going to File Export > Export and saving the resulting calendar file to a logical location for safekeeping.
2. 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.)
---NOTE: Removing these files may remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
Once the computer is back up and running open iCal and test.
Hope that helps.

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