J'ai ces erreurs dans ma console losrque le jeu commence et que les blocs spawnent dans mon inventaire



[07:39:41] [Server thread/WARN]: [FallingVoid] Task #45 for FallingVoid v1.0 generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R3/Packet
	at fr.gravenilvec.fallingvoid.tasks.FallingGameCycle.run(FallingGameCycle.java:62) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-550ebac-7019900]
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-550ebac-7019900]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:709) [spigot.jar:git-Spigot-550ebac-7019900]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-550ebac-7019900]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634) [spigot.jar:git-Spigot-550ebac-7019900]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537) [spigot.jar:git-Spigot-550ebac-7019900]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R3.Packet
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-550ebac-7019900]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-550ebac-7019900]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_131]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_131]
	... 8 more



Minecraft: 1.8
Spigot: 1.8-R0 SNAPSHOT, 872 versions en arrière xd
ProtocolLib: Dernière version (Cela sert t-il?)