solid97单元求解三维静磁场分布出错

zk070315

想用节点法算三维电磁场分布，于是建了一个简单模型，但是求解报错error：*** FATAL ***                           CP =      52.104   TIME= 22:38:18
Unit number -1 is invalid.  This should never occur.      

命令流如下：
/batch,list
/prep7
/title,solid97 application

keyw,magnod,1

et,1,solid97
keyopt,1,1,5
keyopt,1,2,0
keyopt,1,5,2

mp,murx,1,1
mp,rsvx,1,1e-12
mp,murx,2,1
mp,rsvx,2,1e-2

block,-0.02,0.02,-0.02,0.02,0,0.1
block,0.05,0.02,-0.02,0.02,0,0.1
block,-0.02,-0.05,-0.02,0.02,0,0.1
block,-0.05,0.05,0.05,0.02,0,0.1
block,-0.05,0.05,-0.02,-0.05,0,0.1

vglue,all
numcmp,all

type,1
mat,1
vsel,s,,,1
esize,0.004
vsweep,all

type,1
mat,2
vsel,s,,,2,5,1
esize,0.004
vsweep,all

asel,s,,,1
nsla,s,1
d,all,volt,0

asel,s,,,2
nsla,s,1
cp,10,volt,all
nsel,s,,,ndnext(0)
f,all,AMPS,100

allsel,all
asel,s,,,1,26,1
da,all,asym

/SOL
MAGSOLV,0,3,0.001, ,25,

zk070315

有人能指点一下吗