[12:31:27 ERROR]: Could not pass event EntityPickupItemEvent to BanItem v1.1
org.bukkit.event.EventException: null
        at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.exec
ute(MethodHandleEventExecutor.java:37) ~[patched_1.12.2.jar:git-Paper-1304]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:7
8) ~[patched_1.12.2.jar:git-Paper-1304]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[patched_1.12.2.jar:git-Paper-1304]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:515) [patched_1.12.2.jar:git-Paper-1304]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:500) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityItem.d(EntityItem.java:373) [patc
hed_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityHuman.c(EntityHuman.java:419) [pa
tched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityHuman.n(EntityHuman.java:394) [pa
tched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityLiving.B_(EntityLiving.java:1974)
[patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityHuman.B_(EntityHuman.java:146) [p
atched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.EntityPlayer.playerTick(EntityPlayer.ja
va:330) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.PlayerConnection.e(PlayerConnection.jav
a:143) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.NetworkManager.a(NetworkManager.java:25
4) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.ServerConnection.c(ServerConnection.jav
a:150) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:
940) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:
426) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:
767) [patched_1.12.2.jar:git-Paper-1304]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.jav
a:665) [patched_1.12.2.jar:git-Paper-1304]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.ClassCastException: org.bukkit.event.entity.EntityPickupIte
mEvent cannot be cast to org.bukkit.entity.Player
        at io.github.sorahen.banitem.PlayerListener.onPickup(PlayerListener.java
:114) ~[?:?]
        at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.exec
ute(MethodHandleEventExecutor.java:35) ~[patched_1.12.2.jar:git-Paper-1304]
        ... 18 more

换成这个ban插件呢？（比你现在用的那个要好些）

Banitem With NBT使用教程---附下载地址
https://www.mcbbs.net/thread-865052-1-1.html
(出处: Minecraft(我的世界)中文论坛)