iPhone Calendar. Domain=EKErrorDomain Code=14 "Calendar has no source\"

iOS add calendar– Error Domain=EKErrorDomain Code=14 "Calendar has no source"

An error occurred when adding a calendar in the screenshot above: Error Domain=EKErrorDomain Code=14 "Calendar has no source\"

Code：

// Source - https://stackoverflow.com/q/79882772
// Posted by user7076003, modified by community. See post 'Timeline' for change history
// Retrieved 2026-02-05, License - CC BY-SA 4.0

EKCalendar *customCalendar = [EKCalendar calendarForEntityType:EKEntityTypeEvent eventStore:eventStore];
customCalendar.CGColor = UIColor.blueColor.CGColor;
NSArray<EKSource *> *sources = eventStore.sources;
EKSource *selectedSource;
BOOL notFind = YES;
for (EKSource *source in sources) {
    if (source.sourceType == EKSourceTypeLocal || (source.sourceType == EKSourceTypeCalDAV && [source.title.lowercaseString containsString:@"icloud"])) {
        selectedSource = source;
        break;
    }
}
if (selectedSource) {
    customCalendar.source = selectedSource;
}else {
    customCalendar.source = eventStore.defaultCalendarForNewEvents.source;
}
NSError *error = nil;
[eventStore saveCalendar:customCalendar commit:YES error:&error];

User Calendar Source：

; Source - https://stackoverflow.com/q/79882772
; Posted by user7076003, modified by community. See post 'Timeline' for change history
; Retrieved 2026-02-05, License - CC BY-SA 4.0

[{
        "Subscribed Calendars": [
            {
                "title": "中国大陆节假日",
                "type": 3,
                "immutable": "0",
                "allow": "0"
            },
            {
                "title": "Malaysia Holidays",
                "type": 3,
                "immutable": "0",
                "allow": "0"
            }
        ]
    },
    {
        "Other": [
            {
                "title": "生日",
                "type": 4,
                "immutable": "1",
                "allow": "0"
            }
        ]
    }
]

Why is there no "Local" or "iCloud" calendar source?