小弟初学Ansys，请教一个问题，不胜感激

在做谐波相应是遇到问题
运行完后有一个警告：PLVAR is not a recognized BEGIN command,abbreviation,or macro.This command will be ignored.
运行后的结果如图：

这是我的代码：
finish
/clear
/prep7
!定义平板的单元类型
S=0.02 !板的横截面积
et,1,shell63
mp,ex,1,2.2e11
mp,dens,1,7800
mp,prxy,1,0.3
r,1,s
k,1,0,0,0
k,2,1,0,0
k,3,1,1,0
k,4,0,1,0
a,1,2,3,4
!vext,all,,,,,0.01
esize,,25
amesh,1
allsel,all,all
finish
!模态分析
!/solu
!antype,modal
!modopt,subsp,5
!nsel,s,loc,x,0
!nsel,a,loc,x,1
!nsel,a,loc,y,0
!nsel,a,loc,y,1
!d,all,ux,0
!d,all,uy,0
!d,all,uz,0
!nsel,all
!mxpand,5
!save
!solve
!finish
!/post1
!/VIEW,1,1,1,1
!set,last,3
!pldisp,1
!anmode,10,0.05
!finish
!谐响应分析
/solu
antype,3
!hropt,msup,2
!hropt,msup
harfrq,0,200!定义频率范围
!!施加约束
nsel,s,loc,x,0
nsel,a,loc,x,1
nsel,a,loc,y,0
nsel,a,loc,y,1
d,all,ux,0
d,all,uy,0
d,all,uz,0
nsel,all
!!
!allsel,all,all
kbc,0 !指定载荷是阶跃载荷还是递增载荷
nsubst,200 !指定荷载中需要的子步数
!outpr,,none
!outres,,1
f,80,fz,60
solve
finish
/post26
allsel,all,all
file,,rfrq
nsol,2,70,u,z,uz1
nsol,3,50,u,z,uz2
/grid,1
/axlab,y,disp
plvar,2,3 !绘制节点位移频率变化关系曲线
prvar,2,3 !显示位移频率数值
finish
一直检查不出原因，哪位好心人能帮我看看吗