An error feedback

[5igm]

I don't know which causes this error. Because of this error, Nation didn't work. I had tried to delete default config folder, but it cannot solved this problem.

[22:35:29] [Server thread/ERROR] [Sponge/sponge]: Could not pass FMLServerStartedEvent to org.spongepowered.mod.plugin.SpongeModPluginContainer@73b373a7
java.lang.NoClassDefFoundError: org/spongepowered/api/event/entity/DisplaceEntityEvent$TargetPlayer
    at java.lang.Class.getDeclaredMethods0(Native Method) ~[?:1.8.0_101]
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source) ~[?:1.8.0_101]
    at java.lang.Class.privateGetPublicMethods(Unknown Source) ~[?:1.8.0_101]
    at java.lang.Class.getMethods(Unknown Source) ~[?:1.8.0_101]
    at org.spongepowered.common.event.SpongeEventManager.registerListener(SpongeEventManager.java:181) ~[SpongeEventManager.class:1.10.2-2026-5.0.0-BETA-1599]
    at org.spongepowered.common.event.SpongeEventManager.registerListeners(SpongeEventManager.java:225) ~[SpongeEventManager.class:1.10.2-2026-5.0.0-BETA-1599]
    at com.arckenver.nations.NationsPlugin.onStart(NationsPlugin.java:670) ~[NationsPlugin.class:0.10]
    at org.spongepowered.common.event.listener.GameStartedServerEventListener_NationsPlugin_onStart7.handle(Unknown Source) ~[?:?]
    at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.10.2-2026-5.0.0-BETA-1599]
    at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:354) [SpongeModEventManager.class:1.10.2-2026-5.0.0-BETA-1599]
    at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:395) [SpongeModEventManager.class:1.10.2-2026-5.0.0-BETA-1599]
    at org.spongepowered.mod.SpongeMod.onStateEvent(SpongeMod.java:205) [SpongeMod.class:1.10.2-2026-5.0.0-BETA-1599]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_101]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_101]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_101]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_101]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) [minecraft_server.1.10.2.jar:?]
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:239) [LoadController.class:?]
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:217) [LoadController.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_101]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_101]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_101]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_101]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [minecraft_server.1.10.2.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) [minecraft_server.1.10.2.jar:?]
    at net.minecraftforge.fml.common.LoadController.redirect$onPost$0(LoadController.java:53) [LoadController.class:?]
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:142) [LoadController.class:?]
    at net.minecraftforge.fml.common.Loader.serverStarted(Loader.java:851) [Loader.class:?]
    at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarted(FMLCommonHandler.java:297) [FMLCommonHandler.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:433) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]
Caused by: java.lang.ClassNotFoundException: org.spongepowered.api.event.entity.DisplaceEntityEvent$TargetPlayer
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
    ... 38 more

[Arckenver]

What version of sponge are you using ? A NoClassDefFoundError is most commonly due to a break in api backward compatibility.

[5igm]

spongeforge-1.10.2-2026-5.0.0-BETA-1599
@Arckenver

[Arckenver]

Hmm as I thought, Nations still targets SpongeAPI v4.x.x so it won't work with API 5.x.x. I plan on having all 0.x versions (pre-release) of Nations target api 4.x.x and version 1.0 (first official release of Nations) target api 5.x.x.

Btw, don't hesitate to always put the spongeforge jar name when reporting an error, since it contains all relevant information such as Minecraft version, SpongeAPI version, SpongeForge version etc.

[5igm]

Thank you very much.