Server error message 504

Why does my iCal icon keep jumping w/the error message Request for account "Yahoo" failed then server error message 504 and 502. It happens about every 2 minutes! Help

Greetings,
This error suggest you have Yahoo Calendars added to your iCal and iCal is losing connection with the Yahoo servers.
Things to try:
1. First make an iCal backup: Click on each calendar on the left hand side of iCal one 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. Go to iCal > Preferences > Accounts -- Normally there is nothing here. If you have anything in this window (specifically anything that says "Yahoo"), click on it and hit the minus sign "-" to remove it.
--- Note: This will remove any calendars you have from the listed servers (like yahoo). If you find that you actually need the calendars associated with the server you removed, hit the plus sign "+" to add the server back in.
3. Quit iCal and then re-open and test.
Hope that helps.

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Server error message 504

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