[1.21.9/.10] Server crash because of outdated Polymer in UniversalGraves

[JustMili0]

When attempting to start a dedicated server with Lithium 0.20.0 and Universal Graves 3.9.0 for 1.21.9/.10, server fails to start and crashes.
After reading through the logs it turned out to be just na issue with an older version of Polymer. Even tested with a build in which I updated Polymer and everything works perfectly fine then

[SirSethery]

I have the same issue. My 1.21.10 server will not start unless I remove either the latest Lithium or UniversalGraves. Since I'm using a mod manager with daily updates and 3.9.1 hasn't been pushed to Modrinth, I'll just have to remove Lithium until it's on there.

[mxcrx]

It didn't work for me with version 3.9.0, updating to 3.9.1 fixed the issue.

[Destruction-Studios]

As @mxcrx said, updating Universal Graves to 3.9.1 fixes the issue :)

[skdza]

I would like this too :)

[qtqgyt]

Same issue, but just putting a newer version of polymer in the mods folder fixes it, because Jar in Jar looks in the mods folder first.

[DylanDelobel]

Same issue, but just putting a newer version of polymer in the mods folder fixes it, because Jar in Jar looks in the mods folder first.

This fixed my error for 1.21.11