用python批量建立abaqus材料时遇到 AbaqusNameError: 无效的名称？

materials = [ ]

path=r'D:\Abaqus\abaqus setup\jiaoben.txt'

with open(path,'r') as file:

    line=file.readline()

    while line:

        materials.append(line.strip().split('\t'))

        line=file.readline()

for i in range(len(materials)-1):

   mdb.models['Model-1'].Material(name=materials[i+1][0])

   mdb.models['Model-1'].materials[materials[i+1][0]].Density(table=((6450.0, ), ))

   mdb.models['Model-1'].materials[materials[i+1][0]].Depvar(n=300)

   mdb.models['Model-1'].materials[materials[i+1][0]].UserMaterial(

    mechanicalConstants=(materials[i+1][1], materials[i+1][2],materials[i+1][3]))

   print('material {} is created' .format(materials[i+1][0]))

运行时出现  AbaqusNameError: 无效的名称     ，这是咋回事呢？