[opencms-dev] Error on create HTML Page

[Campione Aldo]

Can anybody help me please ??

I use OpenCMS version 5.01
When I try to create a new HTML page in a certain folder iget this error


com.opencms.core.CmsException: 0 Unknown exception. Detailed error: User method getNavPos in calling class com.opencms.workplace.CmsNewResourcePage throwed an exception. java.lang.NumberFormatException: empty String. 
	at com.opencms.workplace.A_CmsWpElement.throwException(A_CmsWpElement.java:397)
	at com.opencms.workplace.CmsSelectBox.handleSpecialWorkplaceTag(CmsSelectBox.java:132)
	at com.opencms.workplace.CmsXmlWpTemplateFile.handleAnyTag(CmsXmlWpTemplateFile.java:234)
	at sun.reflect.GeneratedMethodAccessor83.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.opencms.template.A_CmsXmlContent.processNode(A_CmsXmlContent.java:1515)
	at com.opencms.template.A_CmsXmlContent.getProcessedData(A_CmsXmlContent.java:510)
	at com.opencms.template.CmsXmlTemplateFile.generateElementCacheVariant(CmsXmlTemplateFile.java:588)
	at com.opencms.template.CmsXmlTemplate.startProcessing(CmsXmlTemplate.java:1288)
	at com.opencms.workplace.CmsWorkplaceDefault.startProcessing(CmsWorkplaceDefault.java:550)
	at com.opencms.workplace.CmsNewResourcePage.getContent(CmsNewResourcePage.java:265)
	at com.opencms.template.cache.CmsElementXml.getContent(CmsElementXml.java:171)
	at com.opencms.template.cache.CmsUri.callCanonicalRoot(CmsUri.java:185)
	at com.opencms.template.cache.CmsElementCache.callCanonicalRoot(CmsElementCache.java:149)
	at com.opencms.launcher.CmsXmlLauncher.generateOutput(CmsXmlLauncher.java:285)
	at com.opencms.launcher.CmsXmlLauncher.launch(CmsXmlLauncher.java:341)
	at com.opencms.launcher.A_CmsLauncher.initlaunch(A_CmsLauncher.java:274)
	at com.opencms.core.OpenCms.showResource(OpenCms.java:961)
	at com.opencms.core.OpenCmsHttpServlet.doGet(OpenCmsHttpServlet.java:310)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:738)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Unknown Source)