Bukkit

[11:16:41] [Netty IO #2/ERROR]: Could not pass event ServerListPingEvent to SexyMotd v1.2.2
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.PacketStatusListener.a(PacketStatusListener.java:103) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.PacketStatusInStart.a(SourceFile:25) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.PacketStatusInStart.handle(SourceFile:8) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:72) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.channelRead0(NetworkManager.java:192) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at com.comphenix.protocol.injector.netty.ChannelInjector$4.channelRead(ChannelInjector.java:227) [ProtocolLib-3.4.0.jar:?]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.server.v1_7_R1.LegacyPingHandler.channelRead(SourceFile:89) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at net.minecraft.util.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOfflinePlayer(Ljava/util/UUID;)Lorg/bukkit/OfflinePlayer;
    at net.pixelizedmc.sexymotd.Utils.getIcon(Utils.java:208) ~[?:?]
    at net.pixelizedmc.sexymotd.Main.onPing(Main.java:120) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_25]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_25]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
    ... 36 more

Sorry for the late response. I'm not in the habit of checking tickets.

That error occurs when someone is using a version of craftbukkit previous to when they added UUID support. You need to either use a version of SMOTD that is compatible with your Bukkit version, or upgrade your server.