Omnigator: Error page

net.ontopia.topicmaps.nav2.core.NavigatorRuntimeException: Expected collection which contains topics, base names, variants or topic map refs as elements. But got instance of class net.ontopia.topicmaps.impl.basic.Occurrence.

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Stack Trace of root cause is:
net.ontopia.topicmaps.nav2.core.NavigatorRuntimeException: Expected collection which contains topics, base names, variants or topic map refs as elements.
But got instance of class net.ontopia.topicmaps.impl.basic.Occurrence. 
	at net.ontopia.topicmaps.nav2.utils.Stringificator.toString(Stringificator.java:172)
	at net.ontopia.topicmaps.nav2.taglibs.output.NameTag.generateOutput(NameTag.java:47)
	at net.ontopia.topicmaps.nav2.taglibs.output.BaseOutputProducingTag.doStartTag(BaseOutputProducingTag.java:108)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_output_005fname_005f0(topic_005fcomplete_jsp.java:351)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_template_005fput_005f0(topic_005fcomplete_jsp.java:322)
	at org.apache.jsp.models.topic_005fcomplete_jsp._jspx_meth_template_005finsert_005f0(topic_005fcomplete_jsp.java:240)
	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$Http11ConnectionHandler.process(Http11AprProtocol.java:322)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1699)
	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)