There is no generated mesh to clear.

The structure of my workbench is I have one Mechanical model where I load in steel parts I need for my analysis but I defined them rigid there. Then I have one ACP Pre where I have a part made from composites and I generate a solid model there. These two components are then imported into a static structural component, when I try to solve that, then I get these errors but there is no existing mesh there that I can clear as you suggest.