Error Load curve id 1 is undefine

posy

新人求教~请问这个错误是什么原因，是我定义的分段线性塑性材料的问题吗
MP,DENS,1,7.85  
MP,EX,1,2.07
MP,NUXY,1,0.3                             
TB,PLAW,1,,,8,  
TBDAT,1,20.7  
TBDAT,2,0
TBDAT,3,0.25
TBDAT,4,40  
TBDAT,5,5
TBDAT,6,1
*DIM,STRAIN,ARRAY,4
*DIM,STRESS,ARRAY,4
STRAIN(1)=0,0.08,0.16,0.4
STRESS(1)=20.7,25,27.5,29
EDCURVE,ADD,1,STRAIN(1),STRESS(1)

posy

总是显示错误 Error Load curve id 1 is undefine