hypermesh遇到这种错误，请问大神是怎么回事 *** ERROR # 160 *** Gram-Schmidt reorthogonalization did not converge. This is caused by ill-conditioning of the shifted matrix in Lanczos run. (e.g. zero lower bound specified for a model with rigid body modes.) Solver error no. = 728 subcase id = 1 This error was detected in subroutine splncz4.