Followed tutorial so I could make a pine forest, but crashing on world load.

[Unknown303YT]

I have been practicing modding minecraft, and I needed to make a pine forest biome (I am not copying, it is literally just a weird coincidence we have the same wood type), but my game crashes whenever I try to either load into, or generate, a world. I have no idea why. I will upload my crash report and pine_forest.json files. @Kaupenjoe do you have any idea why?

pine_forest.json
crash-2024-01-17_12.40.25-server.txt

[Unknown303YT]

@CrypticVerse How would I fix this?