Error when simulating droptest in LSdyna!!

Hi everyone!

I know this is a forum about Hypermesh but i still decide to post my problem on it because i know many members expertise in LSdyna.

After i mesh my model with hypermesh, i import it to LSdyna, set up load, contact,... to simulate a droptest. But when i run the solver, i got this error:  Complex sound speed of solid element '

I attach my file below. So could anyone take a look and help me solve this error?

Thank you all!

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