"PermissionError: [Errno 13] Permission denied" when pressing the "convert" button.

[snarks567]

After I set up the VTFCmd and Materials path I managed to generate a set of VTF and VMT files once. However after that first conversion the addon started refusing to generate VTF and VMT files. Instead I get an error message about a "permission" being denied. I tried adding python, Blender and the addon files as an exception in Windows Defender but it doesn't do anything.

Error log:

Python: Traceback (most recent call last):
File "C:\Users\snark\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\Material_To_VTF\VTFLibOperators.py", line 134, in execute
new_image_tex_file = shutil.copy(image_path, os.path.dirname(image_path) + "\" + image_name_to_material_name[image_path] + "" + image_ext)
File "C:\Program Files\Blender Foundation\Blender 4.0\4.0\python\lib\shutil.py", line 417, in copy
copyfile(src, dst, follow_symlinks=follow_symlinks)
File "C:\Program Files\Blender Foundation\Blender 4.0\4.0\python\lib\shutil.py", line 254, in copyfile
with open(src, 'rb') as fsrc:
PermissionError: [Errno 13] Permission denied: 'C:\Program Files\Blender Foundation\Blender 4.0'