Command

[Server thread/INFO]: _Casper_ issued server command: /gmc
[19:21:16] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'gmc' in plugin PrimalUHC v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:647) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1358) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1193) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
    at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.NoSuchMethodError: org.bukkit.entity.Player.sendTitle(Ljava/lang/String;Ljava/lang/String;III)V
    at uhc.primal.plugin.UHCMain.onCommand(UHCMain.java:49) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
    ... 15 more