possible incorrect IDD file

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My model runs with HVAC comprised of VAV and reheat. However, if I switch to Ideal Air I get the following error:

Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2014.12.30 01:21,IDD_Version 8.1.0.009
   ** Severe  ** IP: IDF line~9077 Object=CONTROLLER:MECHANICALVENTILATION, name=CONTROLLER MECHANICAL VENTILATION 1, Required Field=[Zone 1 Name] was blank.
   ** Warning ** IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.
   ** Severe  ** IP: Possible incorrect IDD File
   **   ~~~   ** IDD Version:"IDD_Version 8.1.0.009"

How do I check to insure I have the correct IDD file? Thank you, Matt