Bukkit PokemonSkin — 预览皮肤/购买皮肤/GUI操作[1.12.2] 1.0.1

这个报错怎么解决啊
[02:56:51] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to PokemonSkin v1.0
org.bukkit.event.EventException: null
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:69) ~[EventExecutor$2.class:git-CatServer-1.12.2-5744880]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[RegisteredListener.class:git-CatServer-1.12.2-5744880]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:503) [SimplePluginManager.class:git-CatServer-1.12.2-5744880]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:488) [SimplePluginManager.class:git-CatServer-1.12.2-5744880]
at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:274) [CraftEventFactory.class:git-CatServer-1.12.2-5744880]
at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:241) [CraftEventFactory.class:git-CatServer-1.12.2-5744880]
at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:237) [CraftEventFactory.class:git-CatServer-1.12.2-5744880]
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:1179) [pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:32) [mb.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:9) [mb.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_162]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_162]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:833) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:474) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:770) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:630) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_162]
Caused by: java.lang.NullPointerException
at cn.mcimy.pokemonskin.listener.PokemonListener.onPlayerInteract(PokemonListener.java:41) ~[?:?]
at catserver.server.executor.asm.generated.GeneratedEventExecutor141.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:67) ~[EventExecutor$2.class:git-CatServer-1.12.2-5744880]
... 18 more

为什么更新以后
预览和购买功能没有了