Stiffness Matrix (AMATRX) with complex numbers in UEL

Hi everybody,

I'm working on UEL. The stiffness matrix (AMATRX) which I have
defined is consisting of complex numbers (real and imaginary part).

When I'm running it I'm getting this error message:

Abaqus Error: The executable standard.exe aborted with system
error code 1073741819. Please check the .dat, .msg and .sta files for
error messages if the files exist. ...

I checked the files and no error message was found.

When stiffness matrix is just real numbers, it's working perfectly.

Would you please let me know what should I do?

Thanks in advance.