[TRNSYS-users] ERROR

[rosangela.brunetti at libero.it]

What means:

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

BACKTRACE:
C:/Program Files (x86)/Google/Google SketchUp 
8/Plugins/Trnsys3d/lib/ModelManager.rb:426:in `selection_changed'
C:/Program Files (x86)/Google/Google SketchUp 
8/Plugins/Trnsys3d/lib/observers/SelectionObserver.rb:21:in 
`onSelectionBulkChange'
C:/Program Files (x86)/Google/Google SketchUp 
8/Plugins/Trnsys3d/lib/ModelManager.rb:426

Thanks!