Mac Calendar "Server responded with an error" message

I also have same issue after update... what is problem?

Is there anyone who solve this?

It occurs again and again I think is is app or server problem.

My ipad and phones are fine but only mac has this problem. Maybe it could be mac problem.

Customers can do nothing :(

Tried all of these steps. After reconnecting accounts, still have same calendar sync error. Also, the static calendar data that was there before is now gone too.

macOS Big Sur 11.2.1 running on MBP 16" 2019. Upgraded about a week ago. Calendar error started a couple of days ago.

Also have a MBA 2012 running Big Sur 11.2 and it too now exhibits same problem.

I'm having the same issue with my new IMAC with the Catalina sysmtem, I think I have tried everything and it's very annoying to synch my Google Calender on Mac, arrrrrg!. Has anyone found how to sort it out?

This made my situation worse. ]8

Now I see my email in the list of calendars, but the actual calendars are missing. I tried Cmd+R several times and I don't get the error anymore, but the calendars are completely missing. Did you run into this?

I will merely add that I'm having this problem as well all of a sudden and nothing I have been able to do has fixed it. It usually resolves itself after a bit but then comes back. Over the years calendar has had many problems. Has anyone had any experience with Fantastical?

I have this issue too ... happened today and nothing I do fixes it. Interestingly, I just got this error as part of setup (trying to re-add Google account into my profile) - wondering if it's related at all - looks like apple is trying to confirm the gmail calendar access but the link is broken?

I'll share this with apple now

I migrated to iCloud Calendars years ago because sync issues like this had become all too common between Google and Apple. iCloud works brilliantly and I rarely if ever have had any issues with it. Sadly, I still have to sync a few Google calendars that others have shared with me.

Wait, did it stop happening for everyone? I'm still getting the error, last time at about 4 pm PST. Plus I got a new error on top of it that I hadn't seen before (403? I unfortunately clicked it off before copying the text)!

I'm having same issues as everyone else. I rely heavily on ical syncing with exchange and google calendars for work. Google calendars are still having problems with the error message continuing to come up whenever I put in a new diary entry or try to edit one.

Exactly the same situation here. I followed all the instructions above, including @daviddrahos method - now there's no sync error but all the calendars under my gmail account are missing. This is utter insanity.

I have the same issue. Just started today. Tried deleting the account and re-adding it, tried deleting the calendar agent and the library preferences and calendar data, reset the NVRAM, same issue. Calendar is just fine on Outlook. So clearly an Apple Calendar issue introduced in the last few days. Any other suggestions? Do we know if Apple is aware and working on it? I hate getting on the phone with another apple associate that doesn't know anything and follows a script.

Adding to the tally here. Starting having sporadic issues three days ago, then got worse. 11.2.1 upgrade didn't help. Did the @daviddrahos method and now nothing will show on the calendar at all, none of the above tricks to get even one account (I have one personal google and two business google accounts) to show in calendar. Completely blank with three error icons.

2018 MBP

Giving an update for me it was fixed in the AM and now is not working again. This seems to be consistent with what at least one other person in this thread has said. Some have said sporadic and some have said specifically problems depending on time of day.

I am also still having this issue as of Feb 23, 2021 8:32pm PST. I can no longer trust my computer calendar and must use my phone to be sure I'm not missing my client meetings. This is an URGENT issue. Anyone know the status?

Ok this is not actually working. The calendars are not updating and the "!" is back.

Something is wrong with Apple SW division.

Since High Sierra (when everything was working smoothly and I kept that for a long time) - now I see the following:

• Mail is dreadfully slow accessing Gmail on Google Apps (because it can't limit the downloads)
  • Result - switch to Postbox
• iMessage still never handled group messaging well cross-platform despite years of advance notice
  • Result - switch to Signal
• Reminders is not well integrated (except with Siri) and went through a nasty upgrade where you lose all your reminders (the iPadOS 14 upgrade so your family reminders are split between "old devices" and "new devices" so your kids and you can't share any more)
  • Result - switch to Trello
• iPhoto changed to Photos and became incompatible meaning file-structure backups aren't compatible any more and you can't use tools like Adobe Bridge to manage it
  • Result - switch to Adobe Bridge
• iTunes changed to Music and now forces you into Apple Music streaming even if you pay for Spotify streaming, and so long to your music library, it's not clear where it is or even if it is backed up, if you spent hours making sure it is high bit rate with lyrics, etc.
  • Result - switch to Plex
• And now - to top it off - Calendar stops working with Google - the calendar that everyone actually uses for work. I don't think anyone other than Apple actually uses iCloud for an office calendar!
  • Result - don't know, but I am looking at Fantastical and I need to do something quickly! My family calendar is on iCloud so I need to see both at the same time.

Look at this - I have a Mac and my most important daily software is not from Apple!

Wondering why I should even get a Mac next time...