About MailboxCalendar folder Detail Level

Hi all

I'm using Exchange server 2013 and when i try to change detail level of 1 room mailbox using the cmdlets. It has below error and i cannot apply setting for the mailbox. Please help me?

[PS] C:\Windows\system32>Set-MailboxCalendarFolder -Identity roomtest:\Calendar -DetailLevel LimitedDetails
WARNING: An unexpected error has occurred and a Watson dump is being generated: Value cannot be null.
Parameter name: url
Value cannot be null.
Parameter name: url
    + CategoryInfo          : NotSpecified: (:) [Set-MailboxCalendarFolder], ArgumentNullException
    + FullyQualifiedErrorId : System.ArgumentNullException,Microsoft.Exchange.Management.StoreTasks.SetMailboxCa
   Folder