NameError: uninitialized constant Graphics
  const_missing at org/jruby/RubyModule.java:2642
  handle_button at <script>:44
org.jruby.embed.InvokeFailedException: (NameError) uninitialized constant Graphics
    at org.jruby.embed.internal.EmbedRubyObjectAdapterImpl.call(EmbedRubyObjectAdapterImpl.java:406)
    at org.jruby.embed.internal.EmbedRubyObjectAdapterImpl.callMethod(EmbedRubyObjectAdapterImpl.java:190)
    at org.jruby.embed.ScriptingContainer.callMethod(ScriptingContainer.java:1420)
    at org.jruby.embed.jsr223.JRubyEngine.invokeFunction(JRubyEngine.java:261)
    at plaza.util.script.RubyScriptEngine.contend(RubyScriptEngine.java:80)
    at plaza.util.script.RubyScriptEngine.put(RubyScriptEngine.java:91)
    at plaza.engine.net.packet.impl.DecodeClickButtonPacket.decode(DecodeClickButtonPacket.java:865)
    at plaza.engine.net.ServerEngine.tick(ServerEngine.java:218)
    at plaza.engine.GameEngine.run(GameEngine.java:72)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.jruby.exceptions.RaiseException: (NameError) uninitialized constant Graphics