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This is the Forge forums, only Forge is supported here. Forge is still available for newer versions like 1.21.1 and 1.21.8, you can find downloads for these on the files link on at top of the website (or here).
Despite having "Forge" in the name, NeoForge is a separate thing, leading some to call it "Neo". You can learn more about Neo's origins here.
Where are you applying the flags?
What does "JAVA 17 compatibility mode" mean? Forge 47.4.8 has a minimum of Java 17 to match Minecraft 1.20.1, but also works on Java 21.
The error log suggests removing player animations, did you try that? Usually client side mods like that cannot run on a dedicated server.
Also, please read the FAQ (banner at top of page) with regards ro sharing logs.
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