null
org.bukkit.command.CommandException: Cannot execute command 'npc2' in plugin Citizens v2.0.24-SNAPSHOT (build 1605) - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37) ~[patched_1.15.2.jar:git-Paper-165]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.15.2.jar:git-Paper-165]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:752) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1825) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1633) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:1053) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1046) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1016) ~[patched_1.15.2.jar:git-Paper-165]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:939) ~[patched_1.15.2.jar:git-Paper-165]
at java.lang.Thread.run(Thread.java:834) [?:?]
Выбираешь по тегам сервер Майнкрафт с плагином NPS хотя бы здесь с нескольких попыток должно получиться. А что ошибку выдаёт, так тут масса вариантов и для детального анализа мало вводной информации.