Vray not rendering when override material checked

[alfinmassie]

this is the ruby console error log

==== V-Ray for SketchUp =====
undefined method elementsByTagName' for nil:NilClass + ["C:/ProgramData/ASGVIS/VfS/Ruby/XmlHelpers.rb:160:in get_param_value_node'", "C:/ProgramData/ASGVIS/VfS/Ruby/XmlHelpers.rb:151:in get_param_value_as_text'", "C:/ProgramData/ASGVIS/VfS/Ruby/XmlHelpers.rb:180:in get_bool_parameter_value_from_xml_node'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:951:in can_override_material'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2723:in make_two_sided_material'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2763:in make_face_material'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2865:in process_polymesh'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2814:in process_face'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2397:in block in process_entities'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2397:in each'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2397:in grep'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2397:in process_entities'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2612:in process_override_compdef'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2642:in process_group'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2429:in process_groups_with_grep'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2403:in block in process_entities'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2403:in each'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2403:in grep'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2403:in process_entities'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2541:in process_compdef'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2480:in block in process_compdefs'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2478:in each'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2478:in process_compdefs'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:2053:in process_doc'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:1976:in start_render'", "C:/ProgramData/ASGVIS/VfS/Ruby/R2PCallbacks.rb:538:in start_render_cb'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:1931:in direct_send'", "C:/ProgramData/ASGVIS/VfS/Ruby/VfSExport.rb:1931:in render'", "C:/ProgramData/ASGVIS/VfS/Ruby/R2P.rb:1470:in launch_vray_render'", "C:/ProgramData/ASGVIS/VfS/Ruby/R2PCallbacks.rb:16:in `vfb_render'"]

Scene fully processed in 2.610 seconds

I use sketchup 2016 pro, vray 2.0
windows 8.1 4gb

pls help:(