specifying --alttextures errors

[kd8lvt]

Traceback (most recent call last):
  File "C:\Users\kd8lvt\OneDrive\Desktop\Randomizers\Minecraft\resource_randomiser.py", line 116, in <module>
    processimage(fullfilepath)
  File "C:\Users\kd8lvt\OneDrive\Desktop\Randomizers\Minecraft\resource_randomiser.py", line 102, in processimage
    texturetype = imagepath.split('/')[4]
IndexError: list index out of range

I'm using 2.0.0