哪位大侠帮忙看看，为什么这段命令无法计算？急！！！！

finish
/clear
/prep7
et,1,45
mp,ex,1,200e6
mp,prxy,1,0.3
blc4,,,40,2
blc4,38,2,2,30
VROTAT,1,2,,,,,1,4,180
esize,2
vsweep,all
/solu
allsel,all
asel,s,loc,z,0
da,all,symm
allsel,all
nsel,s,loc,y,0
d,all,uy,0
allsel
csys,5
nsel,s,loc,x,0,38
csys,0
nsel,r,loc,y,2
sf,all,pres,150
allsel,all
sfgrad,pres,0,y,32,-5
csys,5
asel,s,loc,x,38
nsla,r,1
sf,all,pres,0
allsel,all
solve