Run simulation error | undefined method `empty?' for nil:NilClass

[Aaron Boranian]

When clicking on “Apply” or “Run” buttons in Run Simulation dialog that sets up an EnergyPlus simulation for the attached IDF (EnergyPlus v9.6), the following error occurs:

ERROR:
NoMethodError
undefined method `empty?' for nil:NilClass

BACKTRACE:
C:/Users/Aaron Boranian/AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/euclid/lib/legacy_openstudio/lib/dialogs/RunSimulationInterface.rb:173:in report'
C:/Users/Aaron Boranian/AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/euclid/lib/legacy_openstudio/lib/dialogs/Dialogs.rb:120:in report'
C:/Users/Aaron Boranian/AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/euclid/lib/legacy_openstudio/lib/dialogs/Dialogs.rb:329:in on_apply'
C:/Users/Aaron Boranian/AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/euclid/lib/legacy_openstudio/lib/dialogs/Dialogs.rb:310:in block in add_callbacks'
SketchUp:1:in `call'

CONFIGURATION:
Euclid 0.9.4.4
SketchUp 17.2.2555 64-bit
Ruby 2.2.4 x64-mingw32

This happens even if no simulation options are turned on.

Starting from Lines 157-173 of RunSimulationInterface.rb:

      # Configure the RUN PERIOD object
      objects = Plugin.model_manager.input_file.find_objects_by_class_name("RunPeriod")
      if (objects.empty?)
        run_period = InputObject.new("RunPeriod")
        Plugin.model_manager.input_file.add_object(run_period)
      else
        run_period = objects.to_a.first
      end

      run_period.fields[1] = @hash['RUN_PERIOD_NAME'] # name of RunPeriod cannot be left blank as of EnergyPlus v9.2
      run_period.fields[2] = @hash['START_MONTH']
      run_period.fields[3] = @hash['START_DATE']
      run_period.fields[4] = @hash['START_YEAR']
      run_period.fields[5] = @hash['END_MONTH']
      run_period.fields[6] = @hash['END_DATE']
      run_period.fields[7] = @hash['END_YEAR']
      run_period.fields[8] = @hash['START_DAY']

So, trying to set run_period.fields[8] = @hash['START_DAY'] is causing the error message.