Cloning ZoneHVACUniHeater failed to addToThermalZone

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Hi, I am trying to clone a ZoneHVACUnitHeater from a seed .osm file. I was able to successfully clone the heater (heater_in_zone), but was not able to add the unit heater to a thermal zone (thermalZone). My lines of code are:

# Load Heater components unless "no heater" is selected
     if heater_name.eql?("No Heater")
     else
        heat = true
        heater_path = OpenStudio::Path.new("#{File.dirname(__FILE__)}/resources/#{heater_name}.osm")
        heater_inputmodel=translator.loadModel(heater_path)
        heater_inputmodel=heater_inputmodel.get
        heater_in_zone=heater_inputmodel.getZoneHVACUnitHeaters[0]

      end

heater_clone = heater_in_zone.clone(model).to_ZoneHVACUnitHeater.get
heater_clone.addToThermalZone(thermalZones)

When run, the following error occurs:

"Expected argument 1 of type openstudio::model::ThermalZone &, but got Array [#<OpenStudio::Model::ThermalZon....in SWIG method 'addToThermalZone.'"

I'm pretty new to Ruby so am not sure the correct protocol for cloning objects. If anyone could help me that would be great!