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I have defined mass per element as the last parameter of ops.element() command. Should I add another mass with ops.mass() command?

Do you mean I should fix the 'ops.model()' part or 'ops.fix()' part?

Hi, When I run my code, I'm having the error below. How can I solve this issue? Error: FullGenEigenSolver::solve() - the eigenvalue 1 is numerically undetermined or infinite FullGenEigenSolver::solve() - the eigenvalue 2 is numerically undetermined or infinite FullGenEigenSolver::solve() - the eigen...