22:57:23 [INFO] StevensOnln1 issued server command: /biome set plains
22:57:23 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'biome' in plugin BioMed v0.7.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:187)
        at org.bukkit.craftbukkit.v1_5_R2.CraftServer.dispatchCommand(CraftServer.java:523)
        at net.minecraft.server.v1_5_R2.PlayerConnection.handleCommand(PlayerConnection.java:967)
        at net.minecraft.server.v1_5_R2.PlayerConnection.chat(PlayerConnection.java:885)
        at net.minecraft.server.v1_5_R2.PlayerConnection.a(PlayerConnection.java:840)
        at com.bergerkiller.bukkit.common.internal.CommonPlayerConnection.a(CommonPlayerConnection.java:387)
        at net.minecraft.server.v1_5_R2.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_5_R2.NetworkManager.b(NetworkManager.java:292)
        at net.minecraft.server.v1_5_R2.PlayerConnection.d(PlayerConnection.java:113)
        at net.minecraft.server.v1_5_R2.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R2.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:580)
        at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
        at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
        at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
        at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_4_R1/block/CraftBlock
        at me.karlmarx.biomed.BioMedUtils.setBiomes(BioMedUtils.java:26)
        at me.karlmarx.biomed.BioMedCommandExecutor.onCommand(BioMedCommandExecutor.java:131)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 16 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock
        at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 19 more