*** 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.

  

 This error occurs in module "eigdrv".

************************************************************************

RESOURCE USAGE INFORMATION

--------------------------

 MAXIMUM MEMORY USED                                     13772 MB

 MAXIMUM DISK SPACE USED                                 18830 MB

************************************************************************

************************************************************************

COMPUTE TIME INFORMATION

------------------------

 EXECUTION STARTED                         Tue Sep 11 20:02:34 2018    

 EXECUTION COMPLETED                       Tue Sep 11 20:34:30 2018    

 ELAPSED TIME                                         00:31:56

 CPU TIME                                             00:12:04

************************************************************************

  

 

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

 

                        ***** END OF REPORT *****

  

 For Useful OptiStruct Tips and Tricks, go to the URL:

 http://www.altairhyperworks.com/tips.aspx

  

************************************************************************

 OptiStruct error termination report printed to file

 "biw_modes.stat".

 PROGRAM STOPPED DUE TO ERROR.

  

************************************************************************

  

 A fatal error has occurred during computations:

  

  *** 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.

  

  

************************************************************************