Minecraft Version: 1.17.1 version
Java 16
Paper bulid number: 305

This error happens when we use the blood moon command

05.10 08:18:41 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'bloodmoon' in plugin BloodMoon v0.8
05.10 08:18:41 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at org.bukkit.craftbukkit.v1_17_R1.CraftServer.dispatchCommand(CraftServer.java:838) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.network.PlayerConnection.handleCommand(PlayerConnection.java:2257) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:2068) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:2049) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:46) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:6) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$ensureRunningOnSameThread$1(PlayerConnectionUtils.java:56) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.TickTask.run(TickTask.java:18) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.util.thread.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:149) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.executeTask(IAsyncTaskHandlerReentrant.java:23) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.executeTask(MinecraftServer.java:1418) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.executeTask(MinecraftServer.java:192) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.util.thread.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:122) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.bf(MinecraftServer.java:1396) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.executeNext(MinecraftServer.java:1389) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.util.thread.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:132) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.sleepForTick(MinecraftServer.java:1367) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1278) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[patched_1.17.1.jar:git-Paper-283]
05.10 08:18:41 [Server] INFO at java.lang.Thread.run(Thread.java:831) [?:?]