Omnigator: Error page

net.ontopia.topicmaps.nav2.core.NavigatorRuntimeException: net.ontopia.topicmaps.nav2.core.NavigatorRuntimeException: NamesTag expected to get a input collection of topic instances, but got instance of class net.ontopia.topicmaps.impl.basic.TopicName

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Stack Trace of root cause is:
net.ontopia.topicmaps.nav2.core.NavigatorRuntimeException: NamesTag expected to get a input collection of topic instances, but got instance of class net.ontopia.topicmaps.impl.basic.TopicName
	at net.ontopia.topicmaps.nav2.taglibs.TMvalue.NamesTag.process(NamesTag.java:93)
	at net.ontopia.topicmaps.nav2.taglibs.value.BaseValueProducingAndAcceptingTag.doEndTag(BaseValueProducingAndAcceptingTag.java:80)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.runTag(JSPPageExecuter.java:131)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.loopTag(JSPPageExecuter.java:141)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.runTag(JSPPageExecuter.java:123)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.loopTag(JSPPageExecuter.java:141)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.runTag(JSPPageExecuter.java:123)
	at net.ontopia.utils.ontojsp.JSPPageExecuter.run(JSPPageExecuter.java:74)
	at net.ontopia.topicmaps.nav2.impl.basic.Function.call(Function.java:94)
	at net.ontopia.topicmaps.nav2.impl.basic.AbstractFunction.execute(AbstractFunction.java:58)
	at net.ontopia.topicmaps.nav2.taglibs.logic.CallTag.doEndTag(CallTag.java:97)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_logic_005fcall_005f1(topic_005fcomplete_jsp.java:556)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_template_005fput_005f3(topic_005fcomplete_jsp.java:511)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_template_005finsert_005f0(topic_005fcomplete_jsp.java:255)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspService(topic_005fcomplete_jsp.java:136)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:284)
	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:322)
	at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1663)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)