Updating iCal calendars - what is this message?

every once in a while i get a dialog box with this message. there is a progress bar. it is always frozen when i notice it. i usually quit iCal and restart and it is not there.
what does it mean? why is it frozen? what should i do?
iCal seems to work fine.

Forrest Jerome1,
iCal is rebuilding the "Calendar Cache" file.
That process is not normally noticed, but if it is hanging with a progress bar, it indicates to me that the cache file may be corrupt. I would recommend that you force a rebuild by deleting the current Calendar Cache file.
Quit iCal, and find the Calendar Cache file in your Macintosh HD/Users/yourusername/Library/Calendars folder. Drag the Calendar Cache file to the Desktop, and restart iCal which will cause iCal to automatically create another (hopefully uncorrupted) cache file.
;~)

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