求教，optistruct做拓扑优化出现错误#1237！
定义材料、定义边界条件等后，用optistruct求解出现下面错误，请问各位是什么问题？怎么解决？*** ERROR # 1237 ***
CQUAD4 element number 12018 references
a missing or invalid property number 1.
*** ERROR # 1237 ***
CQUAD4 element number 12019 references
a missing or invalid property number 1.
*** ERROR # 1237 ***
CQUAD4 element number 12020 references
a missing or invalid property number 1.
*** ERROR # 1237 ***
CQUAD4 element number 12021 references
a missing or invalid property number 1.
*** ERROR # 14 ***
4 errors found in the input data.
************************************************************************
RESOURCE USAGE INFORMATION
--------------------------
MAXIMUM MEMORY USED 32 MB
MAXIMUM DISK SPACE USED 0 MB
************************************************************************
************************************************************************
COMPUTE TIME INFORMATION
------------------------
EXECUTION STARTED Fri Jan 13 20:01:53 2012
EXECUTION COMPLETED Fri Jan 13 20:01:54 2012
ELAPSED TIME 00:00:00
CPU TIME 00:00:00
************************************************************************
*** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.
***** END OF REPORT *****
For Useful OptiStruct Tips and Tricks, go to the URL:
http://www.altairhyperworks.com/tips.aspx
************************************************************************
There were 4 error messages during input processing.
The first message is repeated below:
*** ERROR # 1237 ***
CQUAD4 element number 12018 references
a missing or invalid property number 1.
************************************************************************ 应该是有的单元没有付属性，或者是在体单元的表面有面单元没有删除
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