<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Ok, my mistake (sort of). Computing numerical frequencies for multireference wavefunctions is tricky since some displacements will break symmetry and then your state designations in your casscf block make no sense. That is what is happening in your current input. The first displacement results in C1 symmetry, so asking for a state with symmetry 2 makes no sense. I've attached an input which seems to work.<div><br></div><div>-Kirk</div><div><br></div><div></div></body></html>