No Solution to Eigen Value Problem

Why does Mechanical software not output any eigenvalue for the model?

This happens when Mechanical software is not able to find a solution to the eigenvalue problem. To fix it, try to insert a Command Snippet object with the command BUCOPT under Analysis. It is recommended to input a nonzero SHIFT value and a reasonable LDMULTE value (i.e., a smaller LDMULTE that is closer to the last buckling mode of interest) when numerical problems are encountered.