After updating your mod from "DynamicTrees-1.12.2-0.9.27.jar" to "DynamicTrees-1.12.2-0.9.28.jar", both server and client crash.
The crash log file is attached.
crash-2022-05-29_13.53.06-server.txt
crash-2022-05-29_13.53.50-client.txt

Getting the same here, version 0.9.27 works fine though.

Yes.
The previous version "DynamicTrees-1.12.2-0.9.27.jar" works fine.

Same here

(Google translation)

Released mod updates "DynamicTrees-1.12.2-0.9.29.jar" and "DynamicTreesPHC-1.12.2-2.0.6.jar" fixed the crash problem: the server and the client start. There are no crashes.
Thanks to the developers for the hard work!

I'm closing the topic!