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FreeMarker template error!

Expression content.threadListPage is undefined on line 19, column 59 in info/magnolia/module/forum/frontend/forum-list.html.
The problematic instruction:
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==> ${content.threadListPage} [on line 19, column 57 in info/magnolia/module/forum/frontend/forum-list.html]
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Java backtrace for programmers:
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freemarker.core.InvalidReferenceException: Expression content.threadListPage is undefined on line 19, column 59 in info/magnolia/module/forum/frontend/forum-list.html.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
at freemarker.core.Environment.visit(Environment.java:416)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:209)
at freemarker.core.Environment.process(Environment.java:189)
at freemarker.template.Template.process(Template.java:237)
at info.magnolia.freemarker.FreemarkerHelper.render(FreemarkerHelper.java:132)
at info.magnolia.module.templating.paragraphs.FreemarkerParagraphRenderer.onRender(FreemarkerParagraphRenderer.java:92)
at info.magnolia.module.templating.AbstractRenderer.render(AbstractRenderer.java:83)
at info.magnolia.module.templating.paragraphs.AbstractParagraphRenderer.render(AbstractParagraphRenderer.java:64)
at info.magnolia.module.templating.ParagraphRenderingFacade.render(ParagraphRenderingFacade.java:111)
at info.magnolia.module.templating.ParagraphRenderingFacade.render(ParagraphRenderingFacade.java:89)
at info.magnolia.cms.taglibs.Include.doEndTag(Include.java:202)
at org.apache.jsp.templates.myTemplate.hello2_jsp._jspx_meth_cms_005fincludeTemplate_005f0(hello2_jsp.java:266)
at org.apache.jsp.templates.myTemplate.hello2_jsp._jspx_meth_cms_005fcontentNodeIterator_005f0(hello2_jsp.java:240)
at org.apache.jsp.templates.myTemplate.hello2_jsp._jspService(hello2_jsp.java:114)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:99)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:199)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at info.magnolia.module.templating.renderers.JspTemplateRenderer.onRender(JspTemplateRenderer.java:73)
at info.magnolia.module.templating.AbstractRenderer.render(AbstractRenderer.java:83)
at info.magnolia.module.templating.renderers.AbstractTemplateRenderer.renderTemplate(AbstractTemplateRenderer.java:76)
at info.magnolia.module.templating.RenderingFilter.doFilter(RenderingFilter.java:93)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.BackwardCompatibilityFilter.doFilter(BackwardCompatibilityFilter.java:72)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.InterceptFilter.doFilter(InterceptFilter.java:121)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.AggregatorFilter.doFilter(AggregatorFilter.java:103)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:61)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.RepositoryMappingFilter.doFilter(RepositoryMappingFilter.java:90)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.module.samples.filters.SampleFilter.doFilter(SampleFilter.java:57)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:76)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:115)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:57)
at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:118)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:82)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:87)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:61)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:84)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:84)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:87)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:96)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:199)
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:191)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)