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I have building with roof trusses. When using element type truss I get a lot of instabilities in my model. I tried to save a substructure and make some of the instabilities go away but I can't fix it. See attached model and picture.
I haven't spend many time no your model but it seems it is due to the fact tht bar 146 and 147 are truss bars. If you set it as normal bar + one support at the roof top node (Ux blocked) to prevent from global rotation, it runs.
Other way to do it : get rid of your truss bar and make a Ry release on the diagonals, same effect, no instabilities and no non linear model due to truss bars
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")