ValueError: no field of name opacity

[Willemsenvisuals]

Python: Traceback (most recent call last):
File "C:\Users\jared\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\blender-addon_init_.py", line 66, in execute
log_opacities = np.asarray(plydata.elements[0]["opacity"])[..., np.newaxis]
File "C:\Users\jared\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\blender-addon\plyfile.py", line 715, in getitem
return self.data[key]
File "C:\Program Files\Blender Foundation\Blender 4.0\4.0\python\lib\site-packages\numpy\core\memmap.py", line 334, in getitem
res = super().getitem(index)
ValueError: no field of name opacity

I've tried using on mac and PC with the 4.0+ version and >3.9 but keep getting similar error messages. This plugin would be a life saver but I can't get it to work for the life of me. Am I doing something wrong?