Unnecessary Exceptions when accessing assets in Document Manager

Exception (non blocking and the operation is correctly exectuted) when coping a main_content from the main list to the empty right_column box (e.g: on the activities page)

[GC 461607K->362565K(1040960K), 0.0274571 secs]
2011-03-22 18:35:25,421: WARN [JCRSessionWrapper] - repository exception : default / org.jahia.services.content.impl.jackrabbit.JackrabbitStoreProvider : invalid identifier: null
2011-03-22 18:35:25,421: ERROR [URLInterceptor] - Exception when transforming placeholder for/##ref:link1##.html
java.lang.NullPointerException
at java.util.UUID.fromString(UUID.java:202)
at org.jahia.services.content.impl.vfs.VFSSessionImpl.getNodeByUUID(VFSSessionImpl.java:111)
at org.jahia.services.content.impl.vfs.VFSSessionImpl.getNodeByIdentifier(VFSSessionImpl.java:273)
at org.jahia.services.content.JCRSessionWrapper.getNodeByUUID(JCRSessionWrapper.java:196)
at org.jahia.services.content.JCRSessionWrapper.getNodeByUUID(JCRSessionWrapper.java:174)
at org.jahia.services.content.interceptor.URLInterceptor$4.doInJCR(URLInterceptor.java:479)
at org.jahia.services.content.interceptor.URLInterceptor$4.doInJCR(URLInterceptor.java:466)
at org.jahia.services.content.JCRTemplate.doExecuteWithSystemSession(JCRTemplate.java:172)
at org.jahia.services.content.interceptor.URLInterceptor.replacePlaceholdersByRefs(URLInterceptor.java:465)
at org.jahia.services.content.interceptor.URLInterceptor.access$000(URLInterceptor.java:69)
at org.jahia.services.content.interceptor.URLInterceptor$2.visit(URLInterceptor.java:295)
at org.jahia.services.render.filter.HtmlTagAttributeTraverser.traverse(HtmlTagAttributeTraverser.java:131)
at org.jahia.services.render.filter.HtmlTagAttributeTraverser.traverse(HtmlTagAttributeTraverser.java:98)
at org.jahia.services.content.interceptor.URLInterceptor.afterGetValue(URLInterceptor.java:291)
at org.jahia.services.content.interceptor.InterceptorChain.afterGetValue(InterceptorChain.java:173)
at org.jahia.services.content.JCRPropertyWrapperImpl.getValue(JCRPropertyWrapperImpl.java:235)
at org.jahia.services.content.JCRNodeWrapperImpl.copyProperties(JCRNodeWrapperImpl.java:1992)
at org.jahia.services.content.JCRNodeWrapperImpl.copy(JCRNodeWrapperImpl.java:1948)
at org.jahia.services.content.JCRNodeWrapperImpl.copy(JCRNodeWrapperImpl.java:1965)
at org.jahia.services.content.JCRNodeWrapperImpl.copy(JCRNodeWrapperImpl.java:1906)
at org.jahia.ajax.gwt.helper.ContentManagerHelper.doPaste(ContentManagerHelper.java:479)
at org.jahia.ajax.gwt.helper.ContentManagerHelper.copy(ContentManagerHelper.java:412)
at org.jahia.ajax.gwt.content.server.JahiaContentManagementServiceImpl.paste(JahiaContentManagementServiceImpl.java:498)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:562)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:544)
at org.jahia.ajax.gwt.commons.server.GWTController.processCall(GWTController.java:130)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:243)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at org.jahia.ajax.gwt.commons.server.GWTController.handleRequest(GWTController.java:109)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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 org.jahia.bin.filters.PassThroughFilter.doFilter(PassThroughFilter.java:60)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.PassThroughFilter.doFilter(PassThroughFilter.java:60)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.jahia.services.seo.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:158)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.jcr.JcrSessionFilter.doFilter(JcrSessionFilter.java:90)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:359)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:275)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:344)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:272)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.PassThroughFilter.doFilter(PassThroughFilter.java:60)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.MaintenanceFilter.doFilter(MaintenanceFilter.java:84)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:554)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:595)
2011-03-22 18:35:25,671: INFO [RulesListener] - Rules executed for default [/sites/ACME_web/home/activities/Right-column/acme-activities-in-brief/j:translation_fr/jcr:language, /sites/ACME_web/home/activities/Right-column/acme-activities-in-brief/j:translation_en/jcr:title, /sites/ACME_web/home/act
ivities/Right-column/acme-activities-in-brief/j:translation_en/body] ... and 12 other nodes in 0ms
Error dumped to file e:\Jahia_xCM_CE_v6.5-36767\tomcat\temp\jahia-errors\2011_03_22\error-2011_03_22-18_35_25_546-17.txt in 157ms
[GC 464901K->368585K(1041216K), 0.0524949 secs]
[GC 470921K->368308K(1040832K), 0.0299488 secs]