RS in Wiki on external server

Throwable: org.olat.core.logging.OLATRuntimeException

logmsg:exception while rendering component 'vc_article' (org.olat.core.gui.components.velocity.VelocityContainer) listener:[org.olat.modules.wiki.WikiMainController [cListener:org.olat.core.util.controller.OLATResourceableListeningWrapperController, ]]
Message of exception: MethodInvocationException occured while merging template: methName:render, refName:r
message:exception while rendering component 'vc_article' (org.olat.core.gui.components.velocity.VelocityContainer) listener:[org.olat.modules.wiki.WikiMainController [cListener:org.olat.core.util.controller.OLATResourceableListeningWrapperController, ]]
Message of exception: MethodInvocationException occured while merging template: methName:render, refName:r,org.olat.core.logging.OLATRuntimeException
 at org.olat.core.gui.components.Window.handleDirties(Window.java:1057)
 at org.olat.core.gui.components.Window.dispatchRequest(Window.java:508)
 at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:282)
 at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
 at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:273)
 at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:190)
 at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:287)
 at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:230)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
 at org.olat.core.servlets.OpenOLATServlet.service(OpenOLATServlet.java:171)
1. cause:
logmsg:MethodInvocationException occured while merging template: methName:render, refName:r
message:MethodInvocationException occured while merging template: methName:render, refName:r,org.olat.core.logging.OLATRuntimeException
 at org.olat.core.gui.render.velocity.VelocityHelper.merge(VelocityHelper.java:162)
 at org.olat.core.gui.render.velocity.VelocityHelper.mergeContent(VelocityHelper.java:177)
 at org.olat.core.gui.components.velocity.VelocityContainerRenderer.render(VelocityContainerRenderer.java:68)
 at org.olat.core.gui.render.Renderer.render(Renderer.java:236)
 at org.olat.core.gui.components.tabbedpane.TabbedPaneRenderer.render(TabbedPaneRenderer.java:89)
 at org.olat.core.gui.render.Renderer.render(Renderer.java:236)
 at org.olat.core.gui.render.Renderer.render(Renderer.java:186)
 at org.olat.core.gui.render.velocity.VelocityRenderDecorator.doRender(VelocityRenderDecorator.java:729)
 at org.olat.core.gui.render.velocity.VelocityRenderDecorator.render(VelocityRenderDecorator.java:396)
 at sun.reflect.GeneratedMethodAccessor205.invoke(Unknown Source)
2. cause:
message:null,java.lang.ExceptionInInitializerError
 at org.olat.modules.wiki.gui.components.wikiToHtml.OlatWikiDataHandler.exists(OlatWikiDataHandler.java:137)
 at org.jamwiki.utils.LinkUtil.buildInternalLinkUrl(LinkUtil.java:312)
 at org.jamwiki.utils.LinkUtil.buildInternalLinkHtml(LinkUtil.java:244)
 at org.jamwiki.parser.jflex.WikiLinkTag.buildInternalLinkUrl(WikiLinkTag.java:97)
 at org.jamwiki.parser.jflex.WikiLinkTag.processLinkContent(WikiLinkTag.java:204)
 at org.jamwiki.parser.jflex.WikiLinkTag.parse(WikiLinkTag.java:114)
 at org.jamwiki.parser.jflex.AbstractLexer.parseToken(AbstractLexer.java:106)
 at org.jamwiki.parser.jflex.JAMWikiProcessor.yylex(JAMWikiProcessor.java:1413)
 at org.jamwiki.parser.jflex.JFlexParser.lex(JFlexParser.java:114)
 at org.jamwiki.parser.jflex.JFlexParser.parseProcess(JFlexParser.java:220)
3. cause:
message:null,java.lang.NullPointerException
 at org.jamwiki.Environment.loadProperties(Environment.java:342)
 at org.jamwiki.Environment.loadProperties(Environment.java:314)
 at org.jamwiki.utils.InterWikiHandler.(InterWikiHandler.java:40)
 at org.olat.modules.wiki.gui.components.wikiToHtml.OlatWikiDataHandler.exists(OlatWikiDataHandler.java:137)
 at org.jamwiki.utils.LinkUtil.buildInternalLinkUrl(LinkUtil.java:312)
 at org.jamwiki.utils.LinkUtil.buildInternalLinkHtml(LinkUtil.java:244)
 at org.jamwiki.parser.jflex.WikiLinkTag.buildInternalLinkUrl(WikiLinkTag.java:97)
 at org.jamwiki.parser.jflex.WikiLinkTag.processLinkContent(WikiLinkTag.java:204)
 at org.jamwiki.parser.jflex.WikiLinkTag.parse(WikiLinkTag.java:114)
 at org.jamwiki.parser.jflex.AbstractLexer.parseToken(AbstractLexer.java:106)