我的问题出在哪里了?大家帮帮我啊

liming020198

我的命令行如下:
/PREP 7
ET, 1, SOLID 70
ET, 2, SURF 152, 1,,,1,1
ET, 3, PLANE 55
KEYOPT, 2, 1, 1
MP, KXX, 1, 48
MP, C, 1, 500
MP, DENS, 7850
MP, EMIS, 0.64
MP, KXX, 2, 50
MP, C, 2, 500
MP, DENS, 2, 8000
MP, EMIS, 2, 0.8
MP, EMIS, 3, 1
MP, EMIS, 4, 0
建模
BLOCK,-0.24,0.24,-0.16,0.16,0,0.44
BLOCK,-0.2,0.2,-0.1,0.1,0.44,0.5
VADD,1,2
KWPLAN,,15,14,11
CYL4,0,0,0.1035,,0.1095,,0.4
VGEN,,3,3,,-0.4,-0.11,0.2,,0,1
画网格
MSHAPE,1,3D
VATT,1,,1, （选圆管）
AATT,2,,3,, （大立方体的六个面）
AATT,4,,3,, （小立方体的四个小面）
VMESH,1,3
/PSYMB,ESYS,1
FINISH
辐射
TYPE, 2      
REAL, 2
MAT, 3
N, 10000, 0.3, 0, 0.5
ESURF, 10000
FINISH
/AUX 12
GEOM, 2
EMIS, 1, 0.64
EMIS, 2, 0.8
STEF, 5.67E-8
VTYPE, 0
WRITE, RADIATION  (ERROR:No element for form factor matrix)
FINISH
/PREP 7
DOF, TEMP
ET, 4, MATRIX 50, 1,,,,, 1
TYPE, 4
SE, RADIATION
加载
热负荷加载到大立方体的垂直于地面的四个面

TIME  (S)0102030
TEMP（℃）2050400500
计算
/SOLU
ANTYPE, TRANS
TOFFST, 273
D, 10000, TEMP, 20
TIME,30
NSUBST,10，，，1
AUTOTS,1
OUTRES,ALL,1
OUTPR,BASIC,1
SOLVE
ErrorFor Radiation Substructure matrix, please set keyopt(1)=1 ) 这是什么意思？怎么解决啊?