求助一个优化的产生的错误问题

252686193

fh=0.02
fl=0.55
tk=0.001
d1=0.001
d2=0.002
d3=0.03
n=nint(fl/d2)
/prep7
rect,0,fl,0,fh,
KWPAVE,       4
rect,0,fl,0,tk,
KWPAVE,       8
rect,0,d1,0,d3,
FLST,3,1,5,ORDE,1   
FITEM,3,3   
AGEN,n,P51X, , ,d2, , , ,0
WPSTYLE,,,,,,,,0
nummrg,all,,,,low
aglue,all
NUMCMP,ALL  
ET,1,FLUID141  
MPTEMP,,,,,,,,  
MPTEMP,1,0
MPDATA,KXX,1,,0.613   
MPDATA,C,1,,4179
MPDATA,DENS,1,,997   
MPDATA,VISC,1,,1e-6
MPDATA,EX,2,,1.17e11
MPDATA,PRXY,2,,0.324  
MPDATA,DENS,2,,8500  
MPDATA,KXX,2,,93
MPDATA,C,2,,380
ASEL,U, , ,       1
AATT,       2, ,   1,       0,
ESIZE,0.001,0,
ALLSEL,ALL
ASEL, , , ,       1
AATT,       1, ,   1,       0,  
ESIZE,0.002,0,
ALLSEL,ALL
amesh,all
finish
/SOLU
lsel,s,loc,y,0,0.02
lsel,r,loc,x,0
dl,all, ,TEMP,80,0
DL,all, ,VX,0.05,1   
DL,all, ,VY,0,1
lsel,s,loc,y,0,0.02
lsel,r,loc,x,0.55
DL,all, ,PRES,0,1
lsel,s,loc,x,0,0.55
lsel,r,loc,y,0.022,0.05
sfl,all,conv,12.5,,25,
lsel,s,loc,y,0.051
sfl,all,conv,12.5,,25,
*do,i,1,n
lsel,s,loc,y,0.021
lsel,r,loc,x,(i-1)*d2+d1,i*d2
sfl,all,conv,12.5,,25,
*enddo
ALLSEL,ALL  
FLDATA1,SOLU,FLOW,1
FLDATA1,SOLU,TEMP,1
FLDATA1,SOLU,RDSF,1
FLDATA7,PROT,DENS,CONSTANT  
FLDATA8,NOMI,DENS,997,  
FLDATA7,PROT,VISC,CONSTANT  
FLDATA8,NOMI,VISC,1e-4,
FLDATA7,PROT,COND,CONSTANT  
FLDATA8,NOMI,COND,0.613,
FLDATA7,PROT,SPHT,CONSTANT  
FLDATA8,NOMI,SPHT,4179,
FLDATA2,ITER,EXEC,50,
solve
finish
/post1
set,last
etable,avtemp,temp
a=node(0.55,0,0)
b=node(0.55,0.02,0)
path,p1,2,30,20
ppath,1,a
ppath,2,b
PDEF, ,TEMP, ,AVG   
PCALC,INTG,inttemp,TEMP,YG,1,   
paget,pzz,table
avtemp=abs(pzz(21,6))/0.02  !平均温度
eplot
save
lgwrite,coolingtemp,lgw,,comment
finish
/opt
opanl,coolingtemp,lgw  
opvar,d2,dv,0.002,0.005
opvar,avtemp,obj
save
opkeep,on
optype,subp
opsave,optcoolingtemp,opt
opexec
finish
这是我的分析命令流，我运行时到第二步迭代优化时，出现一个错误"error  attempting to back up unusalble resuls file.check read/write permission file.rfo".然后提示error while building the flotran object.
头痛几天了，请高手帮我解决下，万分感谢。