Hello there; There are serious loads on the coating in your project. Pay attention to the unit of loads. The default wall loads on the beams remain untouched, your wall load should not be. You have activated options such as catching from the closest point in modeling, so while your purlins on the scissors are on the scissors only in the first and last scissors, the scissor heads and the purlins overlap because you hold different points in the modeling of the other scissors. I re-entered your scissors one by one. I fixed your lovers. I fixed your cladding and beam loads. For the lower and upper head of the truss, it is very difficult for you to pass by using an L profile with a span of 29m, in terms of the slenderness condition for the earthquake code and AISC. I have defined the composite section, analyze and check the design results. You need to divide your purlins at all intersections with the divide command, it looks one piece throughout the structure, I divided your purlins. Please watch the modeling video in the link