Error getting all calendars: Error Domain=EKCADErr

I have an app that is supposed to load a list of calendars into a pickerview. It works, but only after the app crashes and is opened again. I am not sure why it will not work on the initial opening of the app.

Calendar Permission Request:

func requestCalendarPermissions() {
eventInstance.requestAccess(to: .event, completion: {(accessGranted: Bool, error: Error?) in

    if accessGranted == true {
        print("Access Has Been Granted")
        }
    else {
        print("Change Settings to Allow Access")
    }
    })
}

Checking the Permission Status:

func checkStatus() {
let currentStatus = EKEventStore.authorizationStatus(for: EKEntityType.event)

if currentStatus == EKAuthorizationStatus.notDetermined {
    requestCalendarPermissions()
}
else if currentStatus == EKAuthorizationStatus.authorized {
    print("Access Has Been Granted")
}
else if (currentStatus == EKAuthorizationStatus.denied) || (currentStatus == EKAuthorizationStatus.restricted){
    print("Access Has Been Denied")
}
}

PickerView Code:

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return calendars.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return calendars[row].title
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    CalendarField.text = calendars[row].title
    calID = calendars[row].calendarIdentifier
}

This error comes up:

Error getting all calendars: Error Domain=EKCADErrorDomain Code=1013 "(null)"

The app finally crashes because it tries to fill the pickerView and there is no data to fill with. I do load the calendars.

But, for some reason this doesn't happen after the app crashes and is reopened.

Thanks

[Update]

Console out:

2016-11-26 18:04:23.856 PTF[98143:2347570] Error getting all calendars: Error Domain=EKCADErrorDomain Code=1013 "(null)" Calendars Loaded 2016-11-26 18:04:23.869 PTF[98143:2347569] Error getting all calendars: Error Domain=EKCADErrorDomain Code=1013 "(null)" Calendars Loaded

Access Has Been Granted 2016-11-26 18:04:25.954 PTF[98143:2347569] Error getting all calendars: Error Domain=EKCADErrorDomain Code=1013 "(null)" Calendars Loaded

2016-11-26 18:04:46.620 PTF[98143:2347522] * Terminating app due to uncaught exception 'NSRangeException', reason: '* -[NSArray0 objectAtIndex:]: index 0 beyond bounds for empty NSArray' *** First throw call stack: ( 0 CoreFoundation 0x000000010bb6634b __exceptionPreprocess + 171 1 libobjc.A.dylib
0x000000010b5c721e objc_exception_throw + 48 2 CoreFoundation
0x000000010bb7dddd -[__NSArray0 objectAtIndex:] + 93 3
libswiftCore.dylib 0x000000010d95311d _TFVs12_ArrayBuffer19_getElementSlowPathfSiPs9AnyObject_ + 125 4 libswiftCore.dylib 0x000000010d953003 _TFVs12_ArrayBuffer10getElementfTSi20wasNativeTypeCheckedSb_x + 147 5 libswiftCore.dylib 0x000000010d963b8a _TFSag9subscriptFSix + 138 6 PTF 0x000000010af8df12 _TFC3PTF19MainScreenTableView10pickerViewfTCSo12UIPickerView12didSelectRowSi11inComponentSi_T_ + 226 7 PTF 0x000000010af8e10a _TToFC3PTF19MainScreenTableView10pickerViewfTCSo12UIPickerView12didSelectRowSi11inComponentSi_T_ + 74 8 UIKit 0x000000010c0d301d -[UIPickerView _sendSelectionChangedForComponent:notify:] + 104 9 UIKit 0x000000010c0d326e -[UIPickerView _sendSelectionChangedFromTable:notify:] + 370 10 UIKit 0x000000010c8a560d -[UIPickerTableView _scrollingFinished] + 187 11 UIKit 0x000000010c8a57fd -[UIPickerTableView scrollViewDidEndDecelerating:] + 30 12 UIKit 0x000000010c1df821 -[UIScrollView(UIScrollViewInternal) _scrollViewDidEndDeceleratingForDelegate] + 91 13 UIKit 0x000000010c1dc362 -[UIScrollView(UIScrollViewInternal) _stopScrollDecelerationNotify:] + 316 14 UIKit 0x000000010c1dc5b9 -[UIScrollView(UIScrollViewInternal) _stopScrollingNotify:pin:tramplingDragFlags:] + 505 15 UIKit 0x000000010c1d4503 -[UIScrollView _smoothScrollWithUpdateTime:] + 3304 16 QuartzCore 0x0000000113fa3bd5 _ZN2CA7Display15DisplayLinkItem8dispatchEy + 57 17 QuartzCore 0x0000000113fa3a95 _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 449 18 CoreFoundation 0x000000010baf8964 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20 19 CoreFoundation 0x000000010baf85f3 __CFRunLoopDoTimer + 1075 20 CoreFoundation 0x000000010baf817a __CFRunLoopDoTimers + 250 21 CoreFoundation
0x000000010baeff01 __CFRunLoopRun + 2065 22 CoreFoundation
0x000000010baef494 CFRunLoopRunSpecific + 420 23 GraphicsServices
0x000000011124aa6f GSEventRunModal + 161 24 UIKit
0x000000010c0eff34 UIApplicationMain + 159 25 PTF
0x000000010af9f36f main + 111 26 libdyld.dylib
0x000000010f30368d start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

I've just run into this problem. After 'requestAccess' the documentation says to call 'reset' on the eventInstance. However even this did not get things working. However getting a new eventInstance did. I'm using objective c, so I release the EKEventStore object I was using and allocate a new one.