at java.base/java.util.Optional.orElseThrow(Optional.java:403) at ProtocolLib.jar//com.comphenix.protocol.utility.MinecraftReflection.getMinecraftClass ...

[19:07:42 WARN]: [ProtocolLib] Version (MC: 1.21.0) has not yet been tested! Proceed with caution. java.lang.IllegalArgumentException: Unable to find a field that matches {modifiers=[required: 10000, ...