[10:26:45 INFO]: _Cezar issued server command: /spawner skeleton
[10:26:45 INFO]: [Essentials] checking if _Cezar has essentials.spawner - true
[10:26:45 INFO]: [Essentials] checking if _Cezar can afford charge.
[10:26:45 INFO]: [Essentials] calculated command (spawner) cost for _Cezar as 0
[10:26:45 INFO]: Error calling the command /spawner
java.lang.Exception: ž4Target block must be a mob spawner.
        at com.earth2me.essentials.commands.Commandspawner.run(Commandspawner.java:35) ~[?:?]
        at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:180) ~[?:?]
        at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:526) ~[?:?]
        at com.earth2me.essentials.Essentials.onCommand(Essentials.java:401) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at org.bukkit.craftbukkit.v1_13_R1.CraftServer.dispatchCommand(CraftServer.java:693) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.PlayerConnection.handleCommand(PlayerConnection.java:1634) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.PlayerConnection.a(PlayerConnection.java:1469) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.PlayerConnectionUtils.a(SourceFile:10) ~[spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_162]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_162]
        at net.minecraft.server.v1_13_R1.SystemUtils.a(SourceFile:198) [spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:884) [spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.DedicatedServer.w(DedicatedServer.java:411) [spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.MinecraftServer.v(MinecraftServer.java:819) [spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at net.minecraft.server.v1_13_R1.MinecraftServer.run(MinecraftServer.java:717) [spigot.jar:git-Spigot-0b44fa0-1ef1ffd]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_162]