附件是出现问题的项目文件
预计问题出在：
me.fantuan233.happytree.papi.regpapi
以下是服务端的错误输出报告：
[11:50:32] [Server thread/INFO]: fantuan_233[/127.0.0.1:56605] logged in with entity id 303 at ([world]26.651953300254753, 63.0, -30.693190143332917)
[11:51:09] [Server thread/INFO]: fantuan_233 issued server command: /papi parse me %happytree_top%
[11:51:09] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'papi' in plugin PlaceholderAPI v2.11.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:761) ~[spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PlayerConnection.handleCommand(PlayerConnection.java:1936) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PlayerConnection.c(PlayerConnection.java:1779) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:1732) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:49) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:28) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.PlayerConnectionUtils$$Lambda$4404/0x0000000000000000.run(Unknown Source) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:1061) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:1054) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer.sleepForTick(MinecraftServer.java:1038) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:970) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:273) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at net.minecraft.server.v1_16_R3.MinecraftServer$$Lambda$3272/0x0000000000000000.run(Unknown Source) [spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
at java.lang.Thread.run(Thread.java:836) [?:?]
Caused by: java.lang.NullPointerException
at me.fantuan233.happytree.papi.regpapi.onRequest(regpapi.java:46) ~[?:?]
at me.clip.placeholderapi.replacer.CharsReplacer.apply(CharsReplacer.java:161) ~[?:?]
at me.clip.placeholderapi.PlaceholderAPI.setPlaceholders(PlaceholderAPI.java:70) ~[?:?]
at me.clip.placeholderapi.commands.impl.local.CommandParse.evaluateParseSingular(CommandParse.java:115) ~[?:?]
at me.clip.placeholderapi.commands.impl.local.CommandParse.evaluate(CommandParse.java:57) ~[?:?]
at me.clip.placeholderapi.commands.PlaceholderCommandRouter.onCommand(PlaceholderCommandRouter.java:105) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-1.16.5.jar:3096a-Spigot-9fb885e-af1a232]
... 21 more
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备注：me.fantuan233.happytree.event.waterplaced这个监听器不能按我设想的正常工作，希望大佬可以额外给些帮助。。（即通过水流破坏树苗来获取放置水流的玩家）
如果需要说的解决措施比较多的话，也可以加我QQ（小号）：1989362225
