optistruct的错误，请问是什么原因？
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*** OptiStruct defaults set from:
global config file: d:\Altair\hw7.0/optistruct/optistruct.cfg
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5820 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5821 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5822 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
global config file: d:\Altair\hw7.0/optistruct/optistruct.cfg
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5820 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5821 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
ERROR # 16 FROM SUBROUTINE renum
CQUAD4 element 5822 references a missing or invalid property.
***** FATAL INPUT DATA ERROR *****
