I am struggling for my round corner to work, I have used it many times in the past but recently it stopped working, everything appears fine, but I can’t add any corners to anything as it says ‘invalid (property filter). I have created a simple box and grouped it and it still does not work! I cannot seem to re download the version either. I have shut down sketchup and reopened and the same thing happens.
Alright. Since you’re using Round Corner you need to open the group or component and select the geometry to use the extension. FredoCorner will round over edges without opening the group or component for editing.
BTW, I see a lot of incorrect tag usage which will create problems for you. Probably mostly from your CAD import but you should fgix that before starting to model.