when i am trying to get appointmnetitem by using GetOccurrence()

like this
Microsoft.Office.Interop.Outlook.AppointmentItem RecurringAptItems = null;
RecurringAptItems =
recurrencePattern.GetOccurrence(dtFrom);

it is giving below error
"You changed one of the recurrences of this item, and this instance no longer
exists. Close any open items and try again."

can u please help me

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