Bat error when trying to warp

[natkemon]

What does this mean?

null caught an exception: java.lang.NoClassDefFoundError: client/MapleClient$1
java.lang.NoClassDefFoundError: client/MapleClient$1
        at client.MapleClient.sendPing(MapleClient.java:770)
        at net.MapleServerHandler.sessionIdle(MapleServerHandler.java:145)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.sess
ionIdle(DefaultIoFilterChain.java:688)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSession
Idle(DefaultIoFilterChain.java:403)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1000(Def
aultIoFilterChain.java:51)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.ses
sionIdle(DefaultIoFilterChain.java:802)
        at org.apache.mina.core.filterchain.IoFilterAdapter.sessionIdle(IoFilter
Adapter.java:103)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSession
Idle(DefaultIoFilterChain.java:403)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1000(Def
aultIoFilterChain.java:51)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.ses
sionIdle(DefaultIoFilterChain.java:802)
        at org.apache.mina.core.filterchain.IoFilterAdapter.sessionIdle(IoFilter
Adapter.java:103)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSession
Idle(DefaultIoFilterChain.java:403)
        at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireSessionIdle
(DefaultIoFilterChain.java:395)
        at org.apache.mina.core.session.AbstractIoSession.notifyIdleSession0(Abs
tractIoSession.java:1160)
        at org.apache.mina.core.session.AbstractIoSession.notifyIdleSession(Abst
ractIoSession.java:1132)
        at org.apache.mina.core.session.AbstractIoSession.notifyIdleness(Abstrac
tIoSession.java:1121)
        at org.apache.mina.core.polling.AbstractPollingIoProcessor.notifyIdleSes
sions(AbstractPollingIoProcessor.java:673)
        at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$700(Ab
stractPollingIoProcessor.java:61)
        at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run
(AbstractPollingIoProcessor.java:975)
        at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnabl
e.java:64)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source) 

[MentaL]

[X-Tasis]

It couldn't locate the class MapleClient, which I don't really know why it's nested to a "1". But whatever.

The thing is the is at the method "sendPing" of the class MapleClient (Which didn't found :s) at line 770.

Read the stacktrace... It's in English.