求各位大神指导，我的钢管混凝土，钢管向混凝土传热的问题
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请高手看看，该怎么改一改才可以运算，总提示in keyword *INITIALCONDITIONS, file "beam10.inp", line 28602: Unknown part instance name 20
6048 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection.
Analysis Input File Processor exited with an error.不能运算
我之前设立的钢管是壳单元，提示Underlying element 1250 instance ste-1 can only have spos or sneg as a face identifier
Error message limit reached. No further error messages will be reported.
Please see the dat file for more errors.
Analysis Input File Processor exited with an error.不能运算，求指导！！！
6048 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection.
Analysis Input File Processor exited with an error.不能运算
我之前设立的钢管是壳单元，提示Underlying element 1250 instance ste-1 can only have spos or sneg as a face identifier
Error message limit reached. No further error messages will be reported.
Please see the dat file for more errors.
Analysis Input File Processor exited with an error.不能运算，求指导！！！
