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Found the bug, I'll add update to this as soon as I test and post. It was a type when I copied and pasted code for electrical equipment to lighting. " instance.designLevel.get > 0" should be " instance.lightingLevel.get > 0"

  instances = spaceType.lights
  instances.each do |instance|
    def_display = instance.definition.name
    if instance.lightingLevel.is_initialized and instance.designLevel.get > 0
      def_value = instance.designLevel.get
      def_value_neat = OpenStudio::toNeatString(def_value,0,true)
      def_units = "W"
    elsif instance.powerPerFloorArea.is_initialized and instance.powerPerFloorArea.get > 0
      def_value = instance.powerPerFloorArea.get / OpenStudio::convert(1,"m^2","ft^2").get
      def_value_neat = OpenStudio::toNeatString(def_value,4,true)
      def_units = "W/ft^2"
    elsif instance.powerPerPerson .is_initialized and instance.powerPerPerson .get > 0
      def_value = OpenStudio::convert(instance.powerPerPerson .get,"m^2","ft^2").get
      def_value_neat = OpenStudio::toNeatString(def_value,0,true)
      def_units = "W/person"
    end
    count = instance.multiplier
    @output_data_space_type_details[:data] << [def_display,def_value_neat,def_units,count]
  end

For reference on how to trace these down. The screenshot below shows how to find the errors in the tree, and then where the error is in the stderr file. In "Apply Measures Now" and in PAT measure warnings and errors are much easier to see.

Found the bug, I'll add update to this as soon as I test and post. It was a type when I copied and pasted code for electrical equipment to lighting. " instance.designLevel.get > 0" should be " instance.lightingLevel.get > 0"

  instances = spaceType.lights
  instances.each do |instance|
    def_display = instance.definition.name
    if instance.lightingLevel.is_initialized and instance.designLevel.get > 0
      def_value = instance.designLevel.get
      def_value_neat = OpenStudio::toNeatString(def_value,0,true)
      def_units = "W"
    elsif instance.powerPerFloorArea.is_initialized and instance.powerPerFloorArea.get > 0
      def_value = instance.powerPerFloorArea.get / OpenStudio::convert(1,"m^2","ft^2").get
      def_value_neat = OpenStudio::toNeatString(def_value,4,true)
      def_units = "W/ft^2"
    elsif instance.powerPerPerson .is_initialized and instance.powerPerPerson .get > 0
      def_value = OpenStudio::convert(instance.powerPerPerson .get,"m^2","ft^2").get
      def_value_neat = OpenStudio::toNeatString(def_value,0,true)
      def_units = "W/person"
    end
    count = instance.multiplier
    @output_data_space_type_details[:data] << [def_display,def_value_neat,def_units,count]
  end

Update: Updated Measure is online

For reference on how to trace these down. The screenshot below shows how to find the errors in the tree, and then where the error is in the stderr file. In "Apply Measures Now" and in PAT measure warnings and errors are much easier to see.