How to model Solid on a steel frame _ Staad?

Hi,

I am a basic staad user, I needed to model wind load on a solid and the load is transferred to the steel frame the solid is resiting on. I have created a plate above the frame and  I tried to model a basic 8 noded solid rectangle with steel material, I got several errors for instabilities at nodes of solid and plate. 

Can anyone please let me know the process of modelling such case?

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