在INP里定义了截面和输出截面弯矩出错

winni

*surface,type=cutting surface,name=。。。

用这个语句定义的，大部分都没有问题，但其中某些个截面就总是出错，换了节点定义也不行，大家帮忙看看到底是什么问题吧，这个问题困扰我很久了，谢谢！

贴一部分附件中的信息

***ERROR: THE NORMAL VECTOR AT NODE 506 INSTANCE PILE-C2-2 ON SURFACE
           ASSEMBLY_PILE-425 CAN NOT BE COMPUTED. CHECK THE SURFACE DEFINITION.
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO
          INTERPRET SOME DATA.  SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION
***ERROR: THE NORMAL VECTOR AT NODE 505 INSTANCE PILE-C2-2 ON SURFACE
           ASSEMBLY_PILE-425 CAN NOT BE COMPUTED. CHECK THE SURFACE DEFINITION.
***ERROR: THE NORMAL VECTOR AT NODE 516 INSTANCE PILE-C2-2 ON SURFACE
           ASSEMBLY_PILE-425 CAN NOT BE COMPUTED. CHECK THE SURFACE DEFINITION.
***WARNING: NODES APPEAR TO BE ON BOTH SIDES OF THE SURFACE SECTION PILE-425
             FOR ELEMENT 881 INSTANCE PILE-C2-2. THE CONTRIBUTIONS TO SECTION
             PRINT/FILE VARIABLES FROM THIS ELEMENT ARE NOT TAKEN INTO ACCOUNT.



附件是DAT文件