"EXCEPTION_ACCESS_VIOLATION" error when running ABAQUS with UMAT

Hi Simulia Community,

I met an error called "Error: standard.exe / rank 0 / thread 0  encountered a system exception 0xC0000005 (EXCEPTION_ACCESS_VIOLATION)" when doing ABAQUS simulation with UMAT.


May I ask that, what is the potential reason of this error? And if possible, what can I do to solve this error?

Many thanks