i tried to use the plugin in paper 1.20.2 and i got an error.
i looked on the issues and i saw this is not working for everyone.
i tried to change my server version to 1.20.1 but i cant transfer my world.
please fix that and make paper 1.20.2 work with that plugin.

Try to use dev build of ProtocolLib v5.1.1 from here:
[1.8-1.19.4]: https://ci.dmulloy2.net/job/
[1.20.*+]: https://ci.dmulloy2.net/job/ProtocolLib/669/

Notice for 1.20 and 1.20.1 users:
Please, use 1.20.2 to confirm your issue with ProtocolLib.

Why not the last build for 1.20.2?
Last build (673) have critical issue at this moment; #2601

If the problem persists, provide more information about your problem using this form:

• This issue is not solved in a development build

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Version Info
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Can confirm ProtocolLib commit 80a097953f98e9aa7ab4c5c0cf3d04ddcbaabd50 inits on PaperMC 1.20.2 build 297 (PaperMC commit 250388defed6660c57f40733c318ac90b846c264)

[15:15:48 INFO]: [ProtocolLib] Loading server plugin ProtocolLib v5.1.1-SNAPSHOT-673
[15:15:49 INFO]: Server permissions file permissions.yml is empty, ignoring it
[15:15:49 INFO]: [ProtocolLib] Enabling ProtocolLib v5.1.1-SNAPSHOT-673
[15:15:49 INFO]: Preparing level "world"
[15:15:50 INFO]: Preparing start region for dimension minecraft:overworld
[15:15:50 INFO]: Time elapsed: 158 ms