System Information
Operating system: windows 10
Graphics card:

Blender Version
Broken:
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error

Exact steps for others to reproduce the error

Based on the default startup or an attached .blend file (as simple as possible).
Python: Traceback (most recent call last):

File "C:\Program Files\Blender Foundation\Blender 2.93\2.93\scripts\addons\io_import_BrushSet.py", line 121, in execute
  LoadBrushSet(self.properties.filepath, self.properties.filename)
File "C:\Program Files\Blender Foundation\Blender 2.93\2.93\scripts\addons\io_import_BrushSet.py", line 70, in LoadBrushSet
  for file in os.listdir(filepath):

NotADirectoryError: [WinError 267] The directory name is invalid: 'E:\\MaskTools\\Mask Tools 1.6\\Brushes\\Brush 3.png'

location: <unknown location>:-1