gistfile1.txt

SEVERE: Exception sending context initialized event to listener instance of class org.jruby.rack.rails.RailsServletContextListener
java.lang.NoSuchMethodError: org.jcodings.Encoding.getCharset()Ljava/nio/charset/Charset;
	at org.jruby.RubyString.decodeString(RubyString.java:683)
	at org.jruby.RubyString.toString(RubyString.java:670)
	at org.jruby.RubyString.asJavaString(RubyString.java:1197)
	at org.jruby.runtime.load.LoadService.tryResourceFromLoadPathOrURL(LoadService.java:1071)
	at org.jruby.runtime.load.LoadService.findLibraryWithoutCWD(LoadService.java:865)
	at org.jruby.runtime.load.LoadService$NormalSearcher.trySearch(LoadService.java:567)
	at org.jruby.runtime.load.LoadService.findFileForLoad(LoadService.java:285)
	at org.jruby.runtime.load.LoadService.smartLoad(LoadService.java:332)
	at org.jruby.runtime.load.LoadService.require(LoadService.java:381)
	at org.jruby.Ruby.initBuiltins(Ruby.java:1520)
	at org.jruby.Ruby.init(Ruby.java:1098)
	at org.jruby.Ruby.newInstance(Ruby.java:182)
	at org.jruby.rack.DefaultRackApplicationFactory.newRuntime(DefaultRackApplicationFactory.java:190)
	at org.jruby.rack.DefaultRackApplicationFactory.createApplication(DefaultRackApplicationFactory.java:198)
	at org.jruby.rack.DefaultRackApplicationFactory.newApplication(DefaultRackApplicationFactory.java:47)
	at org.jruby.rack.PoolingRackApplicationFactory.createApplications(PoolingRackApplicationFactory.java:183)
	at org.jruby.rack.PoolingRackApplicationFactory.fillInitialPool(PoolingRackApplicationFactory.java:134)
	at org.jruby.rack.PoolingRackApplicationFactory.init(PoolingRackApplicationFactory.java:68)
	at org.jruby.rack.RackServletContextListener.contextInitialized(RackServletContextListener.java:45)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
	at org.apache.catalina.core.StandardService.start(StandardService.java:519)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

I'm getting a very similar error, did you solve it?