Error message in ical

When I try to utilize iCalendar I get this error message:
Authentication of account "marilyn's calendar" failed. Please check your login and password information.
Any ideas what to do about this?
Thanks,
Marilyn

Welcome to Apple Discussions,
First make an iCal backup, File > Export > Archive.
Remove the following to the trash and restart your computer:
Home > Library > Caches
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)
__NOTE: Removing these files will 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.
If the issue persists go into iCal > Preferences > Accounts and remove any accounts you see here. If it is an account you need, re-add it.
If the issue persists reset your sync history and try again: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26867.html
Hope that helps.

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I am receiving an error message:
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Error message in ical

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