Sir I am getting an error message in OUTPUT as "SUPPORT OR SPRING IN SLAVE DIRECTION" when I am trying to define a rigid floor diaphragm along with reference load as well as foundation support at the same time in the model in order to instruct STAAD about the Tie Beams in my model but unfortunately I am getting the above mentioned error hence I am unable to complete my analysis.
I have uploaded my STAAD file for the review please check my mistake and let me know the possible solution for it on how to consider both at the same time.