I don't know much about java or coding. But when using Carpet Mod 1.4.161 for Minecraft 1.21.4 of carpet on java, the game crashes with the following reason:
java.lang.RuntimeException: Could not execute entrypoint stage 'client' due to errors, provided by 'carpet' at 'carpet.CarpetServer::onGameStarted'!

crash-2025-01-11_12.02.52-client.txt