Help with using Google SketchUp (here)
For reference the way to check and reset Model ID in case of conflict.
Get model ID.. Open Window -> Ruby Console, paste the following and hit enter:
Sketchup.active_model.get_attribute("3DWarehouse","ModelID")
Reset model ID.. by copy-pasting the following into the console:
Sketchup.active_model.set_attribute("3DWarehouse", "ModelID", "")