I am making estructure, file attached, buckling analysis and during calculation I get error "the iterative solver stopped. Status code:9999 PCGLSS_FATAL May have bad (distorted) elements. No results saved." I change mesh, apply mesh control and so on - nothing works. Also, i try to change solver from FFEPlus to others two - the I get message, that model is overdefined to buckle, but I'm sure it's not. Any ideas how to solve it? Thanks advance!