[21:39:41 WARN]: java.lang.IllegalArgumentException: object is not an instance of declaring class
[21:39:41 WARN]:        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[21:39:41 WARN]:        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[21:39:41 WARN]:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[21:39:41 WARN]:        at java.lang.reflect.Method.invoke(Method.java:606)
[21:39:41 WARN]:        at fromgate.weatherman.WMSysTools.getOriginalBiome(WMSysTools.java:157)
[21:39:41 WARN]:        at fromgate.weatherman.WMSysTools.getOriginalBiome(WMSysTools.java:147)
[21:39:41 WARN]:        at fromgate.weatherman.WMCmd.ExecuteCmd(WMCmd.java:244)
[21:39:41 WARN]:        at fromgate.weatherman.WMCmd.onCommand(WMCmd.java:63)
[21:39:41 WARN]:        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[21:39:41 WARN]:        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
[21:39:41 WARN]:        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:546)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:933)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:806)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:47)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:647)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:530)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:442)
[21:39:41 WARN]:        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)