Error.java

> [17:04:05] [Server thread/ERROR] [Sponge]: Could not pass FMLServerStartedEvent to Plugin{id=pistonsponge, name=PistonSponge, version=1.0, description=Sponge plugin for Piston, source=/home/container/mods/PistonSponge-1.0-SNAPSHOT-dist.jar}
java.lang.NullPointerException: null
at org.spongepowered.common.world.SpongeWorldArchetypeBuilder.build(SpongeWorldArchetypeBuilder.java:269) ~[SpongeWorldArchetypeBuilder.class:1.12.2-2586-7.1.0-BETA-2905]
at net.modrealms.pistonsponge.PistonSponge.setupResourceWorld(PistonSponge.java:319) ~[PistonSponge.class:?]
at net.modrealms.pistonsponge.PistonSponge.gameInit(PistonSponge.java:168) ~[PistonSponge.class:?]
at org.spongepowered.common.event.listener.GameStartedServerEventListener_PistonSponge_gameInit23.handle(Unknown Source) ~[?:?]
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.12.2-2586-7.1.0-BETA-2905]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:338) [SpongeModEventManager.class:1.12.2-2586-7.1.0-BETA-2905]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:371) [SpongeModEventManager.class:1.12.2-2586-7.1.0-BETA-2905]
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:213) [SpongeImpl.class:1.12.2-2586-7.1.0-BETA-2905]
at org.spongepowered.mod.SpongeMod.onStateEvent(SpongeMod.java:240) [SpongeMod.class:1.12.2-2586-7.1.0-BETA-2905]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) [minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) [minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:253) [LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:231) [LoadController.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) [minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) [minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) [minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.redirect$onPost$zza000(LoadController.java:560) [LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148) [LoadController.class:?]
at net.minecraftforge.fml.common.Loader.serverStarted(Loader.java:782) [Loader.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarted(FMLCommonHandler.java:300) [FMLCommonHandler.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]