运行以下apdl,老是报错，不知如何解决？

本人在网上看了一段空间桁架建模的学习视频，将里面的APDL代码抄下来运行的时候报错

APDL代码如下：

finish

/clear

/prep7

et,1,link180

r,1,300

mp,ex,1,2e5

mp,prxy,1,0.3

k,1

k,2,3000

k,3,3000,3000

k,4,0,3000

l,1,2

l,2,3

l,3,4

l,4,1

l,1,3

l,4,2

lsel,s,loc,x,0.001,3000

lgen,4,all,,,3000

allsel,all

nummrg,all

numcmp,all

k,11,3000,0,3000

l,1,11

l,2,11

l,11,5

lsel,s,loc,z,0.001,3000 

lgen,2,all,,,6000

nummrg,all

numcmp,all

k,13,6000,0,3000

l,5,13

l,11,13

l,13,12

lsel,s,loc,z,0.001,3000

lgen,2,all,,,,3000

nummrg,all

numcmp,all

lsel,s,loc,x,3000,9000

lsel,r,loc,z,0

lgen,2,all,,,,,3000

allsel,all

lovlap,all

lglue,all

allsel,all

latt,1,1,1

lesize,all,,,1

lmesh,all

nummrg,all

numcmp,all

allsel,all

/solu

dk,1,all,0

dk,4,all,0

dk,9,all,0

dk,10,all,0

fk,2,fz,-100

fk,5,fz,-125

allsel,all

solve