建模问题

我正在做一个钢管混凝土的模型,但是按照< >中所介绍的方法定义截面的时候,出现了:
The requested EPLOT command cannot be executed.
Either elements do not exist or the selected elements
are not supported by PowerGraphics.
To correct this situation, try selecting different
elements,etc, or turning off PowerGraphics.
因为我想定义几个截面,所以还得清屏后继续定义截面,不知道如果是好?还请高手不吝赐教啊!

程序:
/prep7
/title,the analyse of steel arch bridge

!*************拱肋截面***********
et,1,82

mp,ex,1,210e9
mp,dens,1,7800
mp,prxy,1,0.3

mp,ex,2,3.35e10 !钢管内混凝土(C50)
mp,dens,2,2800
mp,prxy,2,0.1667

cyl4,0,0,0.484,,0.500 !建立空心钢管截面
cyl4,0,2,0.484,,0.500
rectng,-0.4,-0.384,0.25,1.75
rectng,0.384,0.4,0.25,1.75
asel,all
aptn,all
adele,5,8,1
aadd,all
asel,none

cyl4,0,0,0.484 !建立空心钢管内混凝土截面
cyl4,0,2,0.484
rectng,-0.384,0.384,0.25,1.75
aadd,2,3,4
asel,all
aptn,all
NUMCMP,ALL
aadd,2,3,6
NUMCMP,ALL
asel,,,,4
aatt,1,,1
asel,none
asel,,,,1,3
aatt,2,,1
allsel
aesize,all,0.07
amesh,all
secwrite,gl,sect,,1
sectype,1,beam,mesh
secoffset,cent,,,
secread,'gl','sect',,mesh
asel,all
aclear,all
adele,all,,,1
执行到此,不能使用/replot,因为屏幕左上角还有一个ELEMENTS怎样去除啊?

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