aeroelastic optimization SYSTEM FATAL MESSAGE 3002 (DSFLTF)

[mart9214]

Hi,
greetings.

I'm doing aeroelastic optimization of composite structure using thickness of each lamina as design variable.
I have done optimization using aluminium and it worked, then I changed the material into composite by change the PSHELL properties into PCOMP and MAT1 into MAT8.

I can't get the optimization result, the optimization always stop at 3/5 cycle. Usually, in f06 file, after list of flutter summary there will be design optimization summary but it always stop at flutter summary and show this message:

*** SYSTEM FATAL MESSAGE 3002 (DSFLTF)
EOF ENCOUNTERED WHILE READING DATA BLOCK VDKU (FILE 101) IN SUBROUTINE DSFLTF
0FATAL ERROR
1 * * * END OF JOB * * *


No Symbolic Replacement variables or values were specified.

*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 101 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 102 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 107 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 104 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 106 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 201 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 108 WAS LEFT OPEN AT PROGRAM TERMINATION.
*** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
GINO FILE 109 WAS LEFT OPEN AT PROGRAM TERMINATION.


I've searched in google but can't find anything. please help me.
I appreciate every suggestion, critic, or response. thank you in advance

-martina.