spamming error. server locking-up after this error

2011-12-25 16:40:56 [WARNING] Error calling command /tell
java.lang.Exception: §cPlayer not found.
	at com.earth2me.essentials.commands.Commandmsg.run(Commandmsg.java:57)
	at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:101)
	at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:333)
	at com.earth2me.essentials.Essentials.onCommand(Essentials.java:264)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:378)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:374)
	at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:564)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:541)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
2011-12-25 16:40:56 [INFO] Error: Player not found.
2011-12-25 16:40:56 [WARNING] Error calling command /tell
java.lang.Exception: §cPlayer not found.
	at com.earth2me.essentials.commands.Commandmsg.run(Commandmsg.java:57)
	at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:101)
	at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:333)
	at com.earth2me.essentials.Essentials.onCommand(Essentials.java:264)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:378)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:374)
	at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:564)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:541)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
2011-12-25 16:40:56 [INFO] Error: Player not found.
2011-12-25 16:40:56 [WARNING] Error calling command /tell
java.lang.Exception: §cPlayer not found.
	at com.earth2me.essentials.commands.Commandmsg.run(Commandmsg.java:57)
	at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:101)
	at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:333)
	at com.earth2me.essentials.Essentials.onCommand(Essentials.java:264)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:378)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:374)
	at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:564)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:541)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
2011-12-25 16:40:56 [INFO] Error: Player not found.
2011-12-25 16:40:56 [WARNING] Error calling command /tell
java.lang.Exception: §cPlayer not found.
	at com.earth2me.essentials.commands.Commandmsg.run(Commandmsg.java:57)
	at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:101)
	at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:333)
	at com.earth2me.essentials.Essentials.onCommand(Essentials.java:264)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:378)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:374)
	at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:564)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:541)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)