Error occurred: Specified argument was out of the range of valid values. when trying to convert .ytt to .ass

[MrKomodoDragon]

Was using YTSubConverter on fedora linux to try and convert some srv3 files from youtube to .ass to use with my video player:
mono YTSubConverter.exe --visual "/home/mrkomododragon/Videos/Jet Lag the Game/Season 9/We Played Hide And Seek Across Switzerland.srv3"

and get the error mentioned above.

Here are some logs obtained with mono -v:
https://paste.rs/lN6k

Offending line seems to be:
Method void System.IO.TextWritError occurred: Specified argument was out of the range of valid values.

[MrKomodoDragon]

What would I have to do so this can be fixed?