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OS 2.5: PlantEquipmentOperationSchemes: missing property

I have simple water loop as follows:

image description

It contains the tank of an air-to-water heatpump water heater attached to a zone, and a hot water user.

When running the osm model, the simulation crashes with the following err messages:


Program Version,EnergyPlus, Version 8.9.0-eba93e8e1b, YMD=2018.06.20 10:13,
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_name'.
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_object_type'.
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_schedule_name'.
   **  Fatal  ** Errors occurred on processing input file. Preceding condition(s) cause termination.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=3
   ..... Last severe error=<root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_schedule_name'.
   ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
   ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.
   ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
   ************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
   ************* EnergyPlus Terminated--Fatal Error Detected. 0 Warning; 3 Severe Errors; Elapsed Time=00hr 00min  0.17sec

Apparently, OpenStudio has generated an incomplete IDF file. Did I miss anything necessary to specify ?