Index file is completely blank.

[Nightly-Bit]

When i launch the index file it is just black. Cant see my world render, I know it worked because it took like 1 hour to load it. So why cant I see my map?

[CounterPillow]

because the project is abandoned and doesn't work for newer Minecraft versions. Please see https://overviewer.org/blog/2023/5/9/the-end/
or the bold part of the readme