18:58:32 [INFO] gabizou issued server command: /scs display this
18:58:32 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'scs' in plugin ShowCaseStandalone v1.26
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:492)
        at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:880)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:826)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:808)
        at net.minecraftserverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:124)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
        at net.minecraft.server.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:578)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:213)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.IncompatibleClassChangeError: Class com.miykeal.showCaseStandalone.Commands.DisplayCmd does not implement the requested interface com.miykeal.s
wCaseStandalone.interfaces.Cmd
        at com.miykeal.showCaseStandalone.Listeners.ShowCaseStandaloneCommandExecutor.onCommand(ShowCaseStandaloneCommandExecutor.java:136)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
        ... 16 more