1.20.1
Crashing when generating new world.

[15:38:13] [main/ERROR]: Failed to start the minecraft server java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'createdieselgenerators'! at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.lambda$invoke0$0(EntrypointUtils.java:51) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:49) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke(EntrypointUtils.java:35) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:62) ~[fabric-loader-0.14.22.jar:?] at net.minecraft.server.Main.main(Main.java:112) ~[server-intermediary.jar:?] at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.installer.ServerLauncher.main(ServerLauncher.java:69) ~[fabric-server-mc.1.20.1-loader.0.14.22-launcher.0.11.2.jar:0.11.2] Caused by: java.lang.NoClassDefFoundError: org/apache/commons/compress/utils/Lists at com.jesz.createdieselgenerators.CreativeTab.register(CreativeTab.java:31) ~[creatediselgenerators-2.1.2.jar:?] at com.jesz.createdieselgenerators.CreateDieselGenerators.onInitialize(CreateDieselGenerators.java:36) ~[creatediselgenerators-2.1.2.jar:?] at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47) ~[fabric-loader-0.14.22.jar:?] ... 8 more Caused by: java.lang.ClassNotFoundException: org.apache.commons.compress.utils.Lists at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:226) ~[fabric-loader-0.14.22.jar:?] at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.22.jar:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] at com.jesz.createdieselgenerators.CreativeTab.register(CreativeTab.java:31) ~[creatediselgenerators-2.1.2.jar:?] at com.jesz.createdieselgenerators.CreateDieselGenerators.onInitialize(CreateDieselGenerators.java:36) ~[creatediselgenerators-2.1.2.jar:?] at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47) ~[fabric-loader-0.14.22.jar:?] ... 8 more

if it's just a fabric issue go here https://github.com/mrsterner/Create-Diesel-Generators-Fabric