OpenStudio

Hi everyone,

Can anybody help?! I am trying to put toether an energy plus model, but
when I try to open the idf file into sketchup I get the following error
message:

ERROR:
NoMethodError
undefined method `upcase' for nil:NilClass

BACKTRACE:
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:475:in
`update_object_references'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:474:in `each'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:474:in
`update_object_references'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:465:in `each'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:465:in
`update_object_references'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:447:in `each'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/Bag.rb:81:in `each'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/Bag.rb:81:in `each'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:447:in
`update_object_references'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:78:in `merge'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:52:in `open'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/inputfile/InputFile.rb:18:in `open'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/ModelManager.rb:171:in `open_input_file'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/CommandManager.rb:70:in `open_input_file'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/MenuManager.rb:69:in `create_commands'
C:/Program Files/Google/Google SketchUp
7/Plugins/OpenStudio/lib/MenuManager.rb:69:in `call'