这个例子有问题，运行显示：an invalid file name was specified!!

!（1）分析环境设置
/FILNAME,PRACTICE
/TITLE,DROP OF A HOLLOW BALL
!（2）进入前处理器，定义单元类型、单元选项以及参数
/PREP7
ET,1,SHELL163
KEYOPT,1,1,6
*SET,_RC_SET,1,
R,1
!（3）建立材料模型
!建立一个完全固定的刚体材料模型
RMODIF,1,1, , ,2.5e-3, , , ,
EDMP,RIGI,1,7,7
MP,DENS,1,7800
MP,EX,1,2e11
MP,NUXY,1,0.3
!建立2号材料模型为双线性弹塑性模型
MP,DENS,2,2600
MP,EX,2,7e10
MP,NUXY,2,0.33
TB,BKIN,2,,,,
TBDAT,1,3.5e7
TBDAT,2,1.35e8
!（4）直接建立刚性平面的有限元模型
N, ,-0.6,0.0,-0.6,,,,
N, , -0.6,0.0,0.6,,,,
N, ,0.6,0.0,0.6,,,,
N, ,0.6,0.0,-0.6,,,,
E,1,2,3,4
!（5）建立空心球壳的几何模型并进行网格的划分
SPH4,0.0,0.3,0.06
VDELE,1
AATT,2,1,1
AESIZE,ALL,0.03
AMESH,ALL
!（6）在球壳表面和刚性平台之间建立面对面自动接触
NSEL,S,LOC,Y,0.1,0.5
CM, SPHERE,NODE
ALLSEL ALL
NSEL,S,LOC,Y,-0.1,0.1
CM, TABLE,NODE
ALLSEL ALL
EDCGEN,ASTS,SPHERE,TABLE,0,0,0,0,0, , , , ,0,10000000
!施加初始速度
EDVE,VELO,SPHERE,0,-5.05,0,0,0,0, , , , , ,
!建立时间以及加速度数组并赋值
*DIM,TIME,ARRAY,2,1,1, , ,
*DIM,GY,ARRAY,2,1,1, , ,
*SET,TIME(1,1,1) ,0.0
*SET,TIME(2,1,1) ,1.0
*SET,GY(1,1,1) ,9.8
*SET,GY(2,1,1) ,9.8
!用EDLOAD命令来施加ACLY载荷
EDLOAD,ADD,ACLY,0,SPHERE,TIME,GY, 0, , , , ,
FINISH
/SOL
TIME,0.5,
EDRST,50,
EDHTIME,30,
EDDUMP,1,
EDENERGY,1,1,1,1
solve