ANSYS流固耦合，运行时出现错误（附命令流）

我用的是FSI solver 法，用 SF 及 FSIN 在流体结构界面作两次标记，一次是在界面的流体侧，一次是在界面的固体侧，
但运行时总是出现 "ERROR: NO FSIN boundary conditions are defined in the modal."这样的错误。不知道其原因，希望大家有谁明白，解析一下。谢谢！这是流体、固体部分的命令流。
FINISH
/CLEAR
/BATCH,LIST
/PREP7
/UNITS,SI!国际单位制
ET,1,FLUID142
KEYOPT,1,4,1
CYLIND,0,0.015,-0.063,0.063,90,180
CYLIND,0.015,0.029,-0.020,0.020,90,180
CYLIND,0,0.030,-0.063,0.063,90,180
VSBV,3,1
VSBV,4,2
VATT,1
ESIZE,0.005
MSHAPE,1,3D
MSHKEY,0
VMESH,1
!FLUID SIDE
ASEL,S,AREA,,1
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,1
ASEL,S,,,2
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,2
ASEL,S,,,6
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,3
ASEL,S,,,7
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,4
ASEL,S,,,8
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,5
ASEL,S,,,14
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,6
ASEL,S,,,17
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,7
ASEL,S,,,18
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,8
ALLSEL,ALL
DA,14,ALL,0
DA,17,ALL,0
DA,18,ALL,0
/PREP7
ET,2,SOLID45
MP,EX,2,2.1E11
MP,NUXY,2,0.3
CYLIND,0.030,0.032,-0.065,0.065,90,180
CYLIND,0.015,0.030,-0.065,-0.063,90,180
CYLIND,0.015,0.030,0.063,0.065,90,180
VGLUE,2,3
VGLUE,4,6
CYLIND,0,0.015,-0.100,0.100,90,180
CYLIND,0.015,0.029,-0.020,0.020,90,180
VGLUE,3,6
VSEL,S,VOLU,,2
VATT,2
ESIZE,0.02
MSHAPE,1,3D
MSHKEY,0
VMESH,2
VSEL,S,VOLU,,4,5
VATT,2
ESIZE,0.02
MSHAPE,1,3D
MSHKEY,0
VMESH,4,5
VSEL,S,VOLU,,7,8
VATT,2
ESIZE,0.02
MSHAPE,1,3D
MSHKEY,0
VMESH,7,8
ALLSEL,ALL
!SOLID SIDE
ASEL,S,AREA,,41
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,1
ASEL,S,,,42
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,2
ASEL,S,,,34
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,3
ASEL,S,,,35
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,4
ASEL,S,,,36
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,5
ASEL,S,,,12
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,6
ASEL,S,,,16
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,7
ASEL,S,,,23
ALLSEL,BELOW,AREA
NSLA,S,1
SF,ALL,FSIN,8
ALLSEL,ALL
D,880,ALL,0
D,885,ALL,0
D,890,ALL,0
D,891,ALL,0
FINISH