Error on loading a file

[thirstyice]

The plugin isn't working for me
I get an error when loading a csv file:

(I know text would be better than a screenshot, but it wouldn't let me select it to copy-paste)

NVIM v0.9.5
Plugin installed with vim-plug
No other plugins installed

edit:
MacOS Sonoma 14.2.1

[thirstyice]

Looks like this is a problem with my Neovim, not with this plugin

[chrisbra]

Check your nvim, it seems you cannot execute the following command:

:sil lang mess C