VelocityServlet: Error processing the template

java.lang.IllegalArgumentException
	at sun.reflect.GeneratedMethodAccessor384.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:280)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:215)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:181)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:342)
	at org.apache.velocity.runtime.parser.node.ASTNENode.evaluate(ASTNENode.java:58)
	at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:47)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:69)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:57)
	at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:414)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:117)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:57)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:71)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:57)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:71)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:235)
	at org.apache.velocity.app.Velocity.evaluate(Velocity.java:287)
	at org.apache.velocity.app.Velocity.evaluate(Velocity.java:183)
	at ru.befree.servlets.TemplateServlet.mergeTemplate(TemplateServlet.java:552)
	at ru.befree.servlets.TemplateServlet.doRequest(TemplateServlet.java:494)
	at ru.befree.servlets.TemplateServlet.doGet(TemplateServlet.java:336)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at sun.reflect.GeneratedMethodAccessor324.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:262)
	at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:171)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
	at ru.befree.servlets.filters.CacheFilter.doFilter(CacheFilter.java:106)
	at sun.reflect.GeneratedMethodAccessor1274.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:171)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:775)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:704)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:897)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Thread.java:595)