Need more information man, tell us more

@justin109234 you're not the developer. Are you sure you need more information?

Here it is if you really need it:
Framework 0.7.15 for 1.20.4 requires Java 21. It should not because Minecraft 1.20.4 and below use Java 17.

Can confirm, the forge version (0.7.15) is also mistakenly compiled against java 21 instead of 17 as per this log

Yup, and here it is in the gradle.properties