I had have same problem and already have tried all the same question and found this best answer from suggestions here but no success! appreciate if somebody else in this forum; I copy-paste it here: (in case anybody else with the same question comes here) The SketchUp file (.skp) tell us what is not used in any way by OpenStudio. You should not use SketchUp's File/save or load options. All saves and loads should use the OpenStudio toolbar a successful option to save and load buttons. The .osm file is the only thing that matters.open a OS project created with Sketchup and OS plug in.Thank you. p.s. I have saved my project in sketchup with name.osm; also I tried name.skp and again same problem