If this message occurs during a modal analysis, most likely a frequency search range was specified but no natural frequencies were found in the specified range. Either increase search range or specify that the first N frequencies be found.

If this message occurs during an Eigenvalue Buckling analysis, verify that the loading is in the correct direction (that is, compressive) and that the structure is well constrained so that no rigid body motion can occur. If the applied boundary conditions appear to be correct, it is likely that a buckling failure will not occur.