not recognized as an internal or external command

`
from webptools import dwebp

print(dwebp(input_image="test.webp", output_image="python_logo.jpg",
            option="-q 80", logging="-v"))
`

this is what it prints

"{'exit_code': 1, 'stdout': b'', 'stderr': b"'None' is not recognized as an internal or external command,\r\noperable program or batch file.\r\n", 'command': 'None test.webp -q 80 python_logo.jpg -v'}"