如题,代码：
BookMeta meta = (BookMeta) book.getItemMeta().;
        meta.addPage(plugin.getConfig().getString("text"));
        book.setItemMeta(meta);
        player.openBook(book);复制代码报错：
[12:04:28 ERROR]: Could not pass event PlayerJoinEvent to NPCGUI v1.0
java.lang.ClassCastException: class org.bukkit.craftbukkit.v1_19_R2.inventory.CraftMetaItem cannot be cast to class org.bukkit.inventory.meta.BookMeta (org.bukkit.craftbukkit.v1_19_R2.inventory.CraftMetaItem and org.bukkit.inventory.meta.BookMeta are in unnamed module of loader java.net.URLClassLoader @73a8dfcc)
        at me.npcgui.npcgui.listener.join(listener.java:19) ~[NPCGUI-1.0.jar:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor3.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:git-Purpur-1894]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:680) ~[purpur-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at net.minecraft.server.players.PlayerList.placeNewPlayer(PlayerList.java:319) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at net.minecraft.server.network.ServerLoginPacketListenerImpl.placeNewPlayer(ServerLoginPacketListenerImpl.java:202) ~[?:?]
        at net.minecraft.server.network.ServerLoginPacketListenerImpl.handleAcceptedLogin(ServerLoginPacketListenerImpl.java:183) ~[?:?]
        at net.minecraft.server.network.ServerLoginPacketListenerImpl.tick(ServerLoginPacketListenerImpl.java:85) ~[?:?]
        at net.minecraft.network.Connection.tick(Connection.java:594) ~[?:?]
        at net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:233) ~[?:?]
        at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1594) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:482) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1424) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1194) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:321) ~[purpur-1.19.3.jar:git-Purpur-1894]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]复制代码