Exchange Web Services - OptionalAttendees

When I try to create a new appointment using EWS Managed API, I get the following error.

The request failed schema validation: The element 'OptionalAttendees' in namespace '' has incomplete content. List of possible elements expected: 'Attendee' in namespace ''.

When I add an optional attendee it works but I do not need any optional attendee.
I tried
but no help. But removing it by using

public readonly static ExtendedPropertyDefinition PidLidOptionalAttendees = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.Meeting, 0x00000007, MapiPropertyType.String);
solved my problem.

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