Hackalert

So recently I got a hacker alert plugin and every time I tried running the command it gave me this error:

Code:

Unexpected exception while parsing console command "hackalerts"

org.bukkit.command.CommandException: Unhandled exception executing command 'hackalerts' in plugin HackAlerts3 v0.1

    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at org.bukkit.craftbukkit.v1_7_R2.CraftServer.dispatchCommand(CraftServer.java:696) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at org.bukkit.craftbukkit.v1_7_R2.CraftServer.dispatchServerCommand(CraftServer.java:683) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at net.minecraft.server.v1_7_R2.DedicatedServer.ax(DedicatedServer.java:286) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:251) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:548) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:459) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R2.command.ColouredConsoleSender cannot be cast to org.bukkit.entity.Player

    at cmd.HackAlerts.onCommand(HackAlerts.java:25) ~[?:?]

    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]

    ... 8 more

Can anyone please tell me what is happening, I'm not much of a coder.