VelocityViewServlet : Error processing the template

java.util.NoSuchElementException	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:790)	at java.util.HashMap$ValueIterator.next(HashMap.java:817)	at java.util.Collections.max(Collections.java:640)	at net.sf.classifier4J.summariser.SimpleSummariser.getMostFrequentWords(SimpleSummariser.java:95)	at net.sf.classifier4J.summariser.SimpleSummariser.summarise(SimpleSummariser.java:116)	at sun.reflect.GeneratedMethodAccessor137.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:70)	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)	at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:172)	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:89)	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:70)	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)	at org.apache.velocity.Template.merge(Template.java:256)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:592)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:417)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:373)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97)	at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:155)	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:494)	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:358)	at org.apache.velocity.tools.view.ImportSupport.acquireString(ImportSupport.java:140)	at org.apache.velocity.tools.struts.TilesTool.doInsert(TilesTool.java:476)	at org.apache.velocity.tools.struts.TilesTool.doInsert(TilesTool.java:419)	at org.apache.velocity.tools.struts.TilesTool.processUrl(TilesTool.java:398)	at org.apache.velocity.tools.struts.TilesTool.processAsDefinitionOrURL(TilesTool.java:357)	at org.apache.velocity.tools.struts.TilesTool.processObjectValue(TilesTool.java:305)	at org.apache.velocity.tools.struts.TilesTool.get(TilesTool.java:135)	at sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.velocity.runtime.parser.node.GetExecutor.execute(GetExecutor.java:65)	at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:302)	at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:157)	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)	at org.apache.velocity.Template.merge(Template.java:256)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:592)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:417)	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:373)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97)	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:283)	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:108)	at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)	at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261)	at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:237)	at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:300)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)	at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:194)	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)	at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:435)	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:678)	at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)	at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)	at java.lang.Thread.run(Thread.java:595)