I was able to solve the problem on both my iPhone X and iPad. The error was being generate by my Exchange account. I went to Settings->Accounts & Passwords->[exchange account] . I then switched off the calendar, chose to delete it from my phone, and finally switched it back on. No problems since on either device.
Issue was solved with the suggestions from your end guys
Thanks
Thank you. This worked for me as well. I have been trying to figure this out for a while. Much appreciated.
This absolutely worked perfectly for me! thanks!
This is the correct fix for my Exchange account on my IPad. I don’t believe you even need to restart your device.
I’m having the exact same issue and even with the calendar, contacts and reminders turned off in iCloud settings the issue continues. Brand new phone - come on Apple resolve this issue.
unfortunately this did not solve the issue, any other suggestions?
Perfect thank you worked - was becoming very frustrating cheers I am is 12.01
This worked for me. Thanks!
I have this happening now, new XR, and the suggested solution does not work, any other ideas?
Nope, still there. Turned them off, turned off and restarted the phone, and this was my welcome back screen.
I am having the same issue which started with iOS 11. Incredibly frustrating and dangerous when you are navigating using your phone. Nothing I have tried works. I’m to the point that I will just delete the **** calendar off my phone. Apple, please fix this ASAP!
I have the iPhone X and this did not work for me. Everything was working fine until I downloaded OS 11.1.2 that was supposed to fix a bunch of bugs, and now I've got this issue! It keeps popping up every 5 seconds, and this is my primary work phone. *****!!!
Checking all the calendars in my Accounts and shutting off the one causing the problem helped. The “most helpful” solution of shutting the iCloud calendar was not my issue and didn’t help.
This is is still an issue in iOS 11.4.1. Hopefully Apple has this fixed by iOS 12 coming soon. If not Apple, Exchange and Gmail need to check their calendars in the newest iOS and provide updates. It’s ridiculous this issue has been going on so long. My issue just started yesterday. No recent updates or apps or anything. Happened on all my devices. Needed a fix ASAP!
Thank you r_a10013!
I tried this twice, rebooted and still get the error. It's becoming increasingly annoying! I am on IOS 11.0.3. Help!!!!
Having same issue as well. Have tried turning off iCloud multiple times and continue to get error several times a day.
Calendar Invitation Error
