Calendar 'is' new events since last iOS updated

Help! Since the last update (iPhone to iOS 9.2.1 6s), when I add an event to the calendar, it does not add it! It's terrible, and I don't know what to do. I checked my calendar settings. They have not changed. Help!

Error message?

What happens when you add an event? Not "need" at all or you can see a short period and then it disappears?

Tags: iCloud

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