关于nastran实现结构优化的问题

我试着在卡片里面添加:DRESP1和DCONSTR项,但在计算的时候总是报错:
*** SYSTEM FATAL MESSAGE 3001 (DOPR3)
THE INPUT DATA BLOCK NAMED DIT AT POSITION 18 DOES NOT EXIST.
USER INFORMATION: THIS ERROR IS CAUSED BY ONE OF THE FOLLOWING:
1. THE DATA BLOCK WAS NEVER CREATED.
2. THE DATA BLOCK WAS DELETED.
3. THE DATA BLOCK IS SPECIFIED ON A TYPE STATEMENT IN THE CURRENT SUBDMAP OR A HIGHER SUBDMAP
BUT THE CURRENT QUALIFIER VALUES DO NOT MATCH
THE QUALIFIER VALUES OF THE DATA BLOCK(S) ON THE DATABASE.
使用指南提示说是因为建立频率响应时没有赋值，但是不知道具体纠正方法。
以前有人提出过类似的问题，希望高手指点，十分感激。