Commands do not work on server; crashes in singleplayer

[Lieutenant2014]

crash-2020-05-01_16.26.14-server.txt
crash-2020-05-01_16.21.16-server.txt
These first two are from my single player attempts, and also show me joining my server.
latest.log
And the latest.log is from my server. I'm not entirely certain what is happening, but The commands simply do not work, and the chat tells me that the command is invalid. This is from the latest version of your mod.
And whenever I attempt to load up a singleplayer world, it just crashes.

[itssamtaylor]

Hi @Lieutenant2014

I'll make a release for 20w18a, It looks like that's really the only thing that would be causing that issue.

[itssamtaylor]

I've published a release for 20w18a you can download from curseforge or github releases

Let me know if there's any issues