"The server responded with an error" when modifying or deleting an item

I can't modify or edit an item in my MobileMe syncronized calendar. I can move the item to a different date or time, but if I try to delete it or remove an attendee, I get the following error:
The server responded with an error.
The request for “***” in “Calendar” in account ***.***@me.com” failed.
The server responded with
“500”
to operation CalDAVWriteEntityQueueableOperation.
I can't delete the item, or remove attendees from me.com either.
If I create another appointment, I can delete it, so I suspect it has something to do with the fact that I have invited attendees.
Any suggestions?

Are you behind a firewall at work or elsewhere? Does you calendar sync with some other system like google (could be the google server is not responding)? All we know from the message is that your mac cannot reach the server. Maybe try later. Are you using wifi or have an ethernet connection to the router?

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When opening the Calendar app, I am greeted with a box that says "This calendar can not be refreshed." After clicking on "OK" another box pops up saying "The server responded with an error." How can I get rid of these?

When opening the Calendar app, I am greeted with a box that says "This calendar can not be refreshed," and after clicking ok there is another box saying "The server responded with an error." How do I get rid of this. The calendar functions all right, but just have to close both of those boxes after doing any action in the calendar app.

Please take each of the following steps that you haven't already tried, until the problem is resolved. Back up all databefore making any changes.
Step 1
From the Calendar menu bar, select
Calendar ▹ Preferences ▹ Accounts
Choose the affected account from the list on the left and uncheck the box marked
Enable this account
Then check the box again. Test.
Step 2
Make a note of the account settings, then delete the account and add it back with the same settings.
Step 3
If you can't add the account, the settings may be invalid. Verify them. How you do that depends on what kind of account it is. If it's a Google calendar and you've activated 2-step verification, you need to generate an application-specific password in your Google account and enter it in place of your old password.
Step 4
Quit Calendar. Triple-click the line below on this page to select it:
~/Library/Calendars/Calendar Cache
Right-click or control-click the highlighted line and select
Services ▹ Reveal
from the contextual menu.* A Finder window should open with a file named "Calendar Cache" selected.
Move the selected file to the Trash. There may be one or two other files in the same folder with names that begin in "Calendar Cache". If so, delete those files too.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.

When I run ical on my mac I get the error: The server responded with an error. The request for account "Yahoo!" failed. The server responded with "504" to operation CalDAVAccountRefreshQueueableOperation.

When I run ical on my mac I get the error:
The server responded with an error.
The request for account “Yahoo!” failed.
The server responded with
“504”
to operation CalDAVAccountRefreshQueueableOperation.
I hit "go online" and almost immediately I get the same message again. Any ideas?

I am tired of how Yahoo has gotten worse and worse. It is the ONLY account I get problems with DAILY (even after removing and re-adding). AOL will act up once in a while not taking a saved password but accepting it when OK is clicked.... But Yahoo is always responding with such errors.... Today's calendar error is:
The request (CalDAVAccountRefreshQueueableOperation) for account “Yahoo” failed.

ICal issue - "The server responded with an error"

Hi All. I've been having this error pop up on my iCal for the last week after the last iOS update and it's driving me a little batty.
I don't have any shared calendars, appointments loaded in. I'm just running the iCal calendar frm icloud between my Air and my iPhone.
Error that pops up reads:
The server responded with an error.
The URL ***icloud***/principal/ encountered HTTP error 404. Make sure the URL is correct.
I haven't changed anything in settings. The appointments are still syncing between my computer and phone however, this pop up comes up every 5-30 seconds on my computer if iCal is open.
Ideas on how to fix it?

Is this the pop-up you get?
The request for account “[email protected]” failed.
The server responded with
“HTTP/1.1 502 Bad Gateway”
to operation CalDAVAccountRefreshQueueableOperation.
I've never seen it before but am getting it this evening (UK time). Also if I try to log in to MMe Calendar it's not logging in but going to 'find my iPhone' like it did when Mail was mucking about a few weeks back.

TS3999 The server responded with an error

I have tried to amend an entry in Calendar, but when closing the entry it reverts to the previous time (Im trying to keep trtack of my work rota and I did overtime) I get the message.
The Server responded with an error
Access to "M&S Felixstowe" in "CJ Work" in account "CJ's Email" is not permitted.
The server responded:
"403" to operation CalDAVWriteEntityQueeableOperation.
Can anyone help.
I can use it to enter but not amend!!!!

I am tired of how Yahoo has gotten worse and worse. It is the ONLY account I get problems with DAILY (even after removing and re-adding). AOL will act up once in a while not taking a saved password but accepting it when OK is clicked.... But Yahoo is always responding with such errors.... Today's calendar error is:
The request (CalDAVAccountRefreshQueueableOperation) for account “Yahoo” failed.

"The server responded with an error. The server is currently unreachable or the connection was blocked"

Hi, since this morning i receive this message on my Mac Air (10.8.5) when i open iCal (which is synced through iCloud): "The server responded with an error. The server is currently unreachable or the connection was blocked". You know what it can be?
Thanks for your help!

Are you behind a firewall at work or elsewhere? Does you calendar sync with some other system like google (could be the google server is not responding)? All we know from the message is that your mac cannot reach the server. Maybe try later. Are you using wifi or have an ethernet connection to the router?

The server responded with an error. Access to "Don Weist/Winhall" in "Work" in account "iCloud" is not permitted. The server responded: "403" to operation CalDAVWriteEntityQueueableOperation.

"The server responded with an error.
Access to “Don Weist/Winhall” in “Work” in account “iCloud” is not permitted. The server responded: “403” to operation CalDAVWriteEntityQueueableOperation."
Does anyone know how to repair this problem. It just began happening today.
Thanks,
Ken

We previously had a similar issue when migrating multiple accounts from MobileMe to iCloud. The issue was resolved by disabling and then enabling iCal sync through iCloud on our iMacs in System Preferences.
Always backup your calendar before troubleshooting (File > Export > iCal Archive).
The following steps are roughly from a Apple Support Community discussion.
Open iCloud in System Preferences.
Switch off (uncheck) iCal sync in iCloud System Preferences pane.
Backup iCal before doing this. You will need to remove calendar data.
Open iCal and verify the iCloud account is removed in the iCal preferences under accounts.
Close iCal, reopen System Preference and switch on (check) iCal sync in iCloud System Preferences pane.
Reopen iCal and verify the iCloud account is enabled in the iCal preferences under accounts.
At this point if the problem persists you might try completely signing out of iCloud and then signing back in. But remember to backup all related data (iCal, Contacts, Mail, Photostream, etc) before turning off iCloud sync!

The server responded with an error "502"?

What does this mean in i cal?
The server responded with an error "502"?

I am tired of how Yahoo has gotten worse and worse. It is the ONLY account I get problems with DAILY (even after removing and re-adding). AOL will act up once in a while not taking a saved password but accepting it when OK is clicked.... But Yahoo is always responding with such errors.... Today's calendar error is:
The request (CalDAVAccountRefreshQueueableOperation) for account “Yahoo” failed.

The server responded with an error. The request for account "Yahoo" failed. The server responded with "502" to operation CalDAVAccountRefreshQueueableOperation

The server responded with an error. The request for account "Yahoo" failed. The server responded with "502" to operation CalDAVAccountRefreshQueueableOperation

I am tired of how Yahoo has gotten worse and worse. It is the ONLY account I get problems with DAILY (even after removing and re-adding). AOL will act up once in a while not taking a saved password but accepting it when OK is clicked.... But Yahoo is always responding with such errors.... Today's calendar error is:
The request (CalDAVAccountRefreshQueueableOperation) for account “Yahoo” failed.

Invitees isn't working any more!!!! The server responded with an error.

When ever I try to invite someone to an event on my iCal it keeps popping this up!?
*The server responded with an error.*
The request for “name of my event” in “calendar” in account “[email protected]” failed.
The server responded with
“HTTP/1.1 500 Internal Server Error”
to operation CalDAVWriteEntityQueueableOperation.
What does this mean? All I want to do is send someone an invite to a meeting and have it show
up in their iCal. Please help!

Maybe this will help:
https://discussions.apple.com/message/16520653#16520653
If you monitor the "More Like This" box, other solved threads appear. Opening them usually displays other threads.

OMacbook calendar gets the message "the server responded with an error" and is now not syncing. Any idea?

I haven't done anything to my Macbook (I don't think) but out of the blue when adding entries to my calendar, I now get the message "the server responded with an error". Consequently it will not sync with the Cloud. I have an iMac which DOES sync with both iPad and the iPhone.
Anyone any idea?
ALan

Sorry, no help there. Ical does not stay open long enough to do anything with. All it does is crash and apologise and say it will notify Apple.
Guess I will just delete it altogether and use google calendar.

Ical freezes with "the server responded with an error"

Every time I open my calendar I receive "the server responded with an error." The content of an old email is also showing under the message "the server responded with an error."    I am unable to access my calendar.

Back up all data. If you have iCloud calendars, archive them by following the instructions on this page under the heading "Downloading a calendar from iCloud.com." All you need is a web browser, not the Calendar application. Do the same with any other network calendars you have, if possible.
Before taking each of these steps, quit (force quit if necessary) the application. After taking the step, relaunch and test. When the problem is resolved (or when you complete Step 3 without resolving it), stop and close the Library folder.
Step 1
Hold down the option key and select
          Go ▹ Library
from the Finder menu bar. From the folder that opens, move these items (some may not exist) to the Trash, leaving the Library folder open:
          Calendars/Calendar Cache
          Calendars/Calendar Cache-shm
          Calendars/Calendar Cache-wal
Step 2
Move these files from the Library folder to the Desktop (again, some may not exist):
          Containers/com.apple.CalendarAgent (and any others with a name beginning in "com.apple.Calendar")
          Containers/com.apple.iCal (and any others with a name beginning in "com.apple.iCal")
          Preferences/com.apple.CalendarAgent.plist
          Preferences/com.apple.iCal.plist
If the problem is resolved, you may be able to put back some of the items you moved in this step, relaunching and testing after each one. Eventually you may find the one that caused the problem; delete it. Recreate your settings as necessary.
If the problem still isn't solved, put back each of the items you moved in this step, overwriting the one that may have been created in its place. You don't have to put back the files you moved in Step 1.
Step 3
Move this folder to the Desktop:
          Calendars
Note: you're not moving the Calendars application; you're moving a folder named "Calendars". If there's no change, put the folder back where it was.
If the problem is resolved after you move the Calendars folder, the event database is corrupt. You have these choices:
          Restore the folder from a Time Machine snapshot or other backup that predates the corruption.
          Use a third-party application such as Calendar Cleaner to try to repair the database.
For network calendar accounts, such as iCloud, all you should need to do is re-enter them in the preferences. For subscribed calendars, you only need to re-subscribe.

Problem sharing calendar - "The server responded with an error"

I'm trying to share a single calendar that contains a lot of entries of meeting rooms at our local library. I want to share them through MobileMe via an RSS feed.
When I right-click on the calendar name I get the error in the attached image. I'd be grateful for a solution or someone to tell me what I'm doing wrong. Thanks in advance.
Patrick

me too:
When I open Calender I get a message saying, "The Server Responded with an Error. The request for account “iCloud” failed. The server responded with “403” to operation CalDAVAddCalendarQueueableOperation."
MacBook Pro 13" with Retina display, OS X Mavericks (10.9.2)
I did the iCloud sync at Genius Bar (HK)...... the sync took forever for 1+ hour..... have to quit the process for I've another appointment....

Ical Error :The server responded with an error.

Please help!!!!!!! I got Error Message :The server responded with an error. But I can't delete that event which is cause Error I can't find any library to delete my cacha please help!!!!!!!!!!!!!!

Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder.

MY calendar screen on my MacBook Pro is locked up will not let me close. "The server responded with an error" I have tried force quit, and shutting of the computer.

My MacBook Pro 15in mid 2010 4gb 1067, 2.4gighertz i5, os 10.9.5 has locked up the calendar screen displays "The server responded with an error" and will not let me exit the msg or the screen I can use the rest of the computer. I have turned of the computer, force quit and other things. I tried to send a Calendar by email

I tried your suggestion but it did not work (hold shift down when re-launching calendar). Here is the message I keep getting. Help - this endless loop prohibits me from accessing any calendar functions.
The server responded with error.
Access to account “Google” is not permitted.
The server responded:
“403”
to operation CalDAVAccountRefreshQueueableOperation.

"The server responded with an error" when modifying or deleting an item

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