Error 500

[TheloniousSlamDunk]

org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/home/nabble/n2.nabble/lucene/4208056/write.lock
        in delete_message_or_node(nabble:delete_node.naml:17) -  - public void nabble.view.web.template.NodeNamespace.delete_message_or_node(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.Interpreter)
        in var(nabble:delete_node.naml:18) -  - public void nabble.naml.namespaces.BasicNamespace.var(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.Interpreter)
        in page_node(nabble:delete_node.naml:9) -  - public void nabble.view.web.template.NodePageNamespace.page_node(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter)
        in do(nabble:utilities.naml:886) -
        in as_node_page(nabble:utilities.naml:886) -  - public void nabble.view.web.template.NodeNamespace.as_node_page(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter)
        in get_node_from_parameter(nabble:utilities.naml:886) -  - public void nabble.view.web.template.ServletNamespace.get_node_from_parameter(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter) throws java.io.IOException,javax.servlet.ServletException
        in node_page(nabble:delete_node.naml:2) -
        in (nabble:delete_node.naml:1) -

Message: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/home/nabble/n2.nabble/lucene/4208056/write.lock

RequestURI: /template/NamlServlet.jtp

Server: n2.nabble.com
Caused by:

fschmidt.util.servlet.JtpContextServlet$JtpServletException: url=http://homepage.4208056.n2.nabble.com/template/NamlServlet.jtp?macro=delete_post&node=7213091  method=GET user-agent=Mozilla/5.0 (Windows NT 6.0; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 referer=http://homepage.4208056.n2.nabble.com/banners-td7189985.html remote=86.164.55.239
        at fschmidt.util.servlet.JtpContextServlet.handleException(JtpContextServlet.java:563)
        at fschmidt.util.servlet.JtpContextServlet.service2(JtpContextServlet.java:463)
        at fschmidt.util.servlet.JtpContextServlet.service(JtpContextServlet.java:332)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)
        at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:77)
        at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:141)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
        at cachingfilter.CachingFilter.doFilter(CachingFilter.java:161)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
        at fschmidt.util.servlet.BadBotFilter.doFilter(BadBotFilter.java:74)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
        at fschmidt.util.servlet.ConnectionLimitFilter.doFilter(ConnectionLimitFilter.java:68)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
        at nabble.view.lib.NabbleErrorFilter.doFilter(NabbleErrorFilter.java:26)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
        at org.eclipse.jetty.server.Server.handle(Server.java:346)
        at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)
        at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1048)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214)
        at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535)
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: nabble.naml.compiler.TemplateRuntimeException: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/home/nabble/n2.nabble/lucene/4208056/write.lock
        in delete_message_or_node(nabble:delete_node.naml:17) - <n.delete_message_or_node/> - public void nabble.view.web.template.NodeNamespace.delete_message_or_node(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.Interpreter)
        in var(nabble:delete_node.naml:18) - <n.redirect_to.var name='next_url'/> - public void nabble.naml.namespaces.BasicNamespace.var(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.Interpreter)
        in page_node(nabble:delete_node.naml:9) - <n.page_node.delete_node_and_redirect/> - public void nabble.view.web.template.NodePageNamespace.page_node(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter)
        in do(nabble:utilities.naml:886) - <n.get_node_from_parameter.as_node_page.do/>
        in as_node_page(nabble:utilities.naml:886) - <n.get_node_from_parameter.as_node_page.do/> - public void nabble.view.web.template.NodeNamespace.as_node_page(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter)
        in get_node_from_parameter(nabble:utilities.naml:886) - <n.get_node_from_parameter.as_node_page.do/> - public void nabble.view.web.template.ServletNamespace.get_node_from_parameter(nabble.naml.compiler.IPrintWriter,nabble.naml.compiler.ScopedInterpreter) throws java.io.IOException,javax.servlet.ServletException
        in node_page(nabble:delete_node.naml:2) - <n.node_page.>
        in (nabble:delete_node.naml:1) - <macro name="delete_post" requires="servlet">
        at nabble.naml.compiler.Compiler.interpFix(Compiler.java:2010)
        at nabble.naml.compiler.Compiler$Block.run(Compiler.java:1639)
        at nabble.naml.compiler.Compiler$Chunks.run(Compiler.java:1124)
        at nabble.naml.compiler.Compiler$VarScope.run(Compiler.java:1262)
        at nabble.naml.compiler.BlockWrapper.printTo(BlockWrapper.java:58)
        at nabble.naml.compiler.ScopedInterpreterImpl$1.printTo(ScopedInterpreterImpl.java:25)
        at nabble.naml.compiler.TemplatePrintWriter.print(TemplatePrintWriter.java:31)
        at nabble.view.web.template.NodePageNamespace.page_node(NodePageNamespace.java:58)
        at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at nabble.naml.compiler.JavaCall.invoke(JavaCall.java:26)
        at nabble.naml.compiler.Compiler$Block.invoke(Compiler.java:1560)
        at nabble.naml.compiler.Compiler$Block.run(Compiler.java:1628)
        at nabble.naml.compiler.Compiler$Chunks.run(Compiler.java:1124)
        at nabble.naml.compiler.BlockWrapper.printTo(BlockWrapper.java:58)
        at nabble.naml.compiler.ScopedInterpreterImpl$1.printTo(ScopedInterpreterImpl.java:25)
        at nabble.naml.compiler.TemplatePrintWriter.print(TemplatePrintWriter.java:31)
        at nabble.view.web.template.NodeNamespace.as_node_page(NodeNamespace.java:876)
        at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at nabble.naml.compiler.JavaCall.invoke(JavaCall.java:26)
        at nabble.naml.compiler.Compiler$Block.invoke(Compiler.java:1560)
        at nabble.naml.compiler.Compiler$Block.run(Compiler.java:1628)
        at nabble.naml.compiler.BlockWrapper.printTo(BlockWrapper.java:58)
        at nabble.naml.compiler.ScopedInterpreterImpl$1.printTo(ScopedInterpreterImpl.java:25)
        at nabble.naml.compiler.TemplatePrintWriter.print(TemplatePrintWriter.java:31)
        at nabble.view.web.template.ServletNamespace.get_node_from_parameter(ServletNamespace.java:318)
        at sun.reflect.GeneratedMethodAccessor41.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at nabble.naml.compiler.JavaCall.invoke(JavaCall.java:26)
        at nabble.naml.compiler.Compiler$Block.invoke(Compiler.java:1560)
        at nabble.naml.compiler.Compiler$Block.run(Compiler.java:1628)
        at nabble.naml.compiler.Template.run(Template.java:60)
        at nabble.naml.compiler.Template.run(Template.java:33)
        at nabble.modules.ModuleManager.run(ModuleManager.java:269)
        at nabble.view.web.template.NamlServlet.service(NamlServlet.java:152)
        at nabble.view.web.template.NamlServlet.service(NamlServlet.java:126)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at fschmidt.util.servlet.JtpContextServlet.service2(JtpContextServlet.java:461)
        ... 36 more
Caused by: java.lang.RuntimeException: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/home/nabble/n2.nabble/lucene/4208056/write.lock
        at nabble.model.Lucene$1.event(Lucene.java:193)
        at nabble.model.Lucene$1.event(Lucene.java:181)
        at fschmidt.db.ListenerList.event(ListenerList.java:49)
        at fschmidt.db.ListenerList.event(ListenerList.java:49)
        at fschmidt.db.base.DbRecordImpl$3.run(DbRecordImpl.java:308)
        at fschmidt.db.pool.DbDatabaseImpl$Con.commit(DbDatabaseImpl.java:309)
        at fschmidt.db.pool.DbDatabaseImpl.commitTransaction(DbDatabaseImpl.java:105)
        at fschmidt.db.extend.FilterDatabase.commitTransaction(FilterDatabase.java:103)
        at nabble.model.NodeImpl.deleteMessageOrNode(NodeImpl.java:375)
        at nabble.view.web.template.NodeNamespace.delete_message_or_node(NodeNamespace.java:863)
        at sun.reflect.GeneratedMethodAccessor518.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at nabble.naml.compiler.JavaCall.invoke(JavaCall.java:26)
        at nabble.naml.compiler.Compiler$Block.invoke(Compiler.java:1560)
        at nabble.naml.compiler.Compiler$Block.run(Compiler.java:1628)
        ... 76 more
Caused by: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/home/nabble/n2.nabble/lucene/4208056/write.lock
        at org.apache.lucene.store.Lock.obtain(Lock.java:84)
        at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1115)
        at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:959)
        at nabble.model.lucene.IndexCache$MyIndexWriter.<init>(IndexCache.java:164)
        at nabble.model.lucene.IndexCache.openIndexWriter(IndexCache.java:232)
        at nabble.model.Lucene$1.event(Lucene.java:186)
        ... 91 more

Can somebody please explain why this keeps happening whenever I try to post something?