I believe fzf's default colorization is being sent to pygmentize, a python library. And that is complaining that some flag that fzf-tab-completion is not valid only in some circumstances.

I'm having a Windows 10 issue with colorization I'm hoping this group can help me. I've decided to use pygmentize to colorize files in less. Here is an example using pygmentize on the python script ...

Python syntax highlighter This item contains old versions of the Arch Linux package for pygmentize. Website of the upstream project: ...