4:43:23 AM [WARNING] [MultiSkyWars] Task #46 for MultiSkyWars v3.4.6 generated an exception
4:43:23 AM java.lang.NoSuchMethodError: org.bukkit.inventory.meta.ItemMeta.spigot()Lorg/bukkit/inventory/meta/ItemMeta$Spigot;
4:43:23 AM 	at es.minetsii.skywars.serializers.ItemStackSerializer.serialize(ItemStackSerializer.java:56) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.serializers.ItemStackSerializer.serialize(ItemStackSerializer.java:29) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.utils.InventoryUtils.saveMultiInventory(InventoryUtils.java:64) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.managers.ExtrasManager.loadInventory(ExtrasManager.java:47) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.managers.ExtrasManager.load(ExtrasManager.java:28) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.utils.ManagerUtils.addManager(ManagerUtils.java:55) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.utils.ManagerUtils.loadDefManagersAfterCache(ManagerUtils.java:37) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.utils.CacheUtils.load(CacheUtils.java:16) ~[?:?]
4:43:23 AM 	at es.minetsii.skywars.SkyWars$1.run(SkyWars.java:57) ~[?:?]
4:43:23 AM 	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:668) [craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:609) [craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:517) [craftbukkit.jar:git-Bukkit-7019900e]
4:43:23 AM 	at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
4:43:23 AM [INFO] [Citizens] Loaded 0 NPCs.