How to Prevent Eventstore Access Error on First Run

Problems accessing Calendar using EKEventStore on OSX Sierra with Swift 3

You need to add a usage description to your info.plist. This is a small description of why you need access to the services that is presented to the user.

<key>NSCalendarsUsageDescription</key>
<string>Description of why you need access to the Calendar</string>

eventStore.saveCalendar returns an error json error: An unexpected error occurred.

Two possible reasons

1. From the documentation of EKEventStore

   To access the user’s Calendar data, all sandboxed macOS apps must include the com.apple.security.personal-information.calendars entitlement. To learn more about entitlements related to App Sandbox, see Enabling App Sandbox.

2. Check the authorizationStatus of the store and call requestAccess if necessary.

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Your error message is misleading, the error has nothing to do with JSON.

iOS: EKEventStore sources / defaultCalendarForNewEvents / calendarsForEntityType all return nothing AFTER authorization

OK, it turns out there was a small line of code in a viewDidLoad that was before the [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error code and that tried to access the eventStore. It was superfluous and did not need to be happening and I had not noticed it. Once I removed this code the stuff now works, so it does go back to needing to authorize, as even after authorization, the eventStore was already "bad" due to this previous access.

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