Garret PTL error : Template parameter not defined: isMain at /www/Admin/../VzRu/content/WEB-INF/ptl/PhotoReportPage$Area.xml

java.lang.IllegalStateException: Template parameter not defined: isMain at /www/Admin/../VzRu/content/WEB-INF/ptl/PhotoReportPage$Area.xml
	at org.garret.ptl.template.Template$Instance.variable(Template.java:775)
	at org.garret.ptl.template.PtlExpression$VarEx.execute(PtlExpression.java:122)
	at org.garret.ptl.template.Template$ConditionalNode.evalCondition(Template.java:311)
	at org.garret.ptl.template.Template$ConditionalNode.print(Template.java:291)
	at org.garret.ptl.template.Template.write(Template.java:179)
	at org.garret.ptl.template.TemplateComponent.renderHtml(TemplateComponent.java:70)
	at org.garret.ptl.template.Template$ComponentNode.print(Template.java:518)
	at org.garret.ptl.template.Template$ConditionalNode.print(Template.java:292)
	at org.garret.ptl.template.Template$ChooseNode.print(Template.java:328)
	at org.garret.ptl.template.Template.write(Template.java:179)
	at org.garret.ptl.template.TemplateComponent.renderHtml(TemplateComponent.java:70)
	at org.garret.ptl.template.PtlPage.generatePage(PtlPage.java:97)
	at org.garret.ptl.template.MountPoint.handle(MountPoint.java:192)
	at org.garret.ptl.template.MountPoint.handle(MountPoint.java:163)
	at org.garret.ptl.startup.PtlFilterRoot.handlePtl(PtlFilterRoot.java:97)
	at org.garret.ptl.startup.PtlFilterRoot.doFilter(PtlFilterRoot.java:72)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at ru.vz.news.services.dao.impl.hibernate.PortalOpenSessionInViewFilter.doFilterInternal(PortalOpenSessionInViewFilter.java:48)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.garret.ptl.startup.StaticContentServletFilter.doFilter(StaticContentServletFilter.java:105)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.garret.ptl.startup.tomcat.ValveSessionByParam.invoke(ValveSessionByParam.java:27)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
	at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:887)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:696)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2009)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)