How do you set filename patterns?

[DeRpMeister]

I want to make it so that the images are all output into one single folder, but when I use any of the pattern args the output says they are unspecified.

[afterdelight]

show me your command

[DeRpMeister]

I've been trying something like this

python kemono-dl.py --cookies cookies.txt -o C:\Users\xxx --inline-filename-pattern "{title} [{id}]\inline{index}_{filename}.{ext}"

But it tells me inline pattern is invalid.
I'm using the most recent release.

Edit: typos

[afterdelight]

what os are you using? try / instead of \