"ANSYS program has stopped working. A problem caused the program to stop working correctly. Windows will close the program...."

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Dear ANSYS Users,

I am doing an optimization problem by MATLAB which calls ANSYS
for an analysis part in the DO loop (iterations) algorithm.

For a less dof.s problem (about 5,600 Dof.s), it works well
(ANSYS run in the batch mode by a calling command in MATLAB). However,  for more dof.s one (about 100,000 Dof.s)
at the first iteration, there is an error appearing "ANSYS program has
stopped working. A problem caused the program to stop working correctly.
Windows will close the program and notify you if a solution is available".

I already reinstalled ANSYS, but the same thing happened.

Could you please help me on this problem?

Best regards,

Truong Tran