It just syas internal issue occured and sends this is in console
[02:10:34] [Server thread/INFO]: DaltonsMC issued server command: /npc
[02:10:34] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Cannot execute command 'npc' in plugin Citizens v2.0.24-SNAPSHOT (build 1605) - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_19_R1.CraftServer.dispatchCommand(CraftServer.java:833) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at org.bukkit.craftbukkit.v1_19_R1.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:264) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:?]
at net.minecraft.commands.CommandDispatcher.performCommand(CommandDispatcher.java:298) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.commands.CommandDispatcher.a(CommandDispatcher.java:282) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.network.PlayerConnection.b(PlayerConnection.java:1940) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.network.PlayerConnection.lambda$18(PlayerConnection.java:1905) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.util.thread.IAsyncTaskHandler.b(SourceFile:68) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:157) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1150) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:131) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.bh(MinecraftServer.java:1129) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1122) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:140) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1106) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.v(MinecraftServer.java:1017) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:293) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3566-Spigot-584b459-c379a6b]
at java.lang.Thread.run(Thread.java:833) [?:?]