Attributes

[15:48:48 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing 'atributos' in net.Indyuce.mmocore.command.AttributesCommand(atributos)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:169) ~[patched_1.15.1.jar:git-Paper-62]
        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:740) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1820) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1628) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.MinecraftServer.aZ(MinecraftServer.java:1037) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1030) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1014) ~[patched_1.15.1.jar:git-Paper-62]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:937) ~[patched_1.15.1.jar:git-Paper-62]
        at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.NullPointerException
        at net.Indyuce.mmocore.api.player.attribute.PlayerAttributes.getInstance(PlayerAttributes.java:56) ~[?:?]
        at net.Indyuce.mmocore.gui.AttributeView$AttributeItem.getPlaceholders(AttributeView.java:58) ~[?:?]
        at net.Indyuce.mmocore.gui.api.item.InventoryPlaceholderItem.display(InventoryPlaceholderItem.java:94) ~[?:?]
        at net.Indyuce.mmocore.gui.api.item.InventoryItem.display(InventoryItem.java:63) ~[?:?]
        at net.Indyuce.mmocore.gui.api.item.InventoryItem.setDisplayed(InventoryItem.java:51) ~[?:?]
        at net.Indyuce.mmocore.gui.api.GeneratedInventory.getInventory(GeneratedInventory.java:61) ~[?:?]
        at net.Indyuce.mmocore.gui.api.GeneratedInventory.open(GeneratedInventory.java:74) ~[?:?]
        at net.Indyuce.mmocore.command.AttributesCommand.execute(AttributesCommand.java:27) ~[?:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.15.1.jar:git-Paper-62]
        ... 16 more