Hi everybody.
I have an issue when i implemented: Setting Embargo terms via metadata . 
The issues appears when  the submission step ends (Accept license) and 
previously i put liftdate ( embargo.field.lift = dc.embargo.liftdate)  :

   -  In JSPUI: show Internal Server Error, but the submission task is 
   completed (I see the item in the collection with embargo in metadatos and 
   bitstreams).


   - In XMLUI: show Internal Server Error but the submission does not 
   complete. 

This option is using the DefaultEmbargoSetter.
The print error stack is :
Java stacktrace: 
java.lang.NullPointerException
    at 
org.dspace.embargo.DefaultEmbargoSetter.setEmbargo(DefaultEmbargoSetter.java:97)
    at 
org.dspace.embargo.EmbargoServiceImpl.setEmbargo(EmbargoServiceImpl.java:103)
    at 
org.dspace.content.InstallItemServiceImpl.finishItem(InstallItemServiceImpl.java:236)
    at 
org.dspace.content.InstallItemServiceImpl.installItem(InstallItemServiceImpl.java:80)
    at 
org.dspace.content.InstallItemServiceImpl.installItem(InstallItemServiceImpl.java:56)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.archive(BasicWorkflowServiceImpl.java:790)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.doState(BasicWorkflowServiceImpl.java:530)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.advance(BasicWorkflowServiceImpl.java:412)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.pool(BasicWorkflowServiceImpl.java:732)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.doState(BasicWorkflowServiceImpl.java:517)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.advance(BasicWorkflowServiceImpl.java:397)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.pool(BasicWorkflowServiceImpl.java:732)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.doState(BasicWorkflowServiceImpl.java:510)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.advance(BasicWorkflowServiceImpl.java:379)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.pool(BasicWorkflowServiceImpl.java:732)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.doState(BasicWorkflowServiceImpl.java:503)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.advance(BasicWorkflowServiceImpl.java:361)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.advance(BasicWorkflowServiceImpl.java:333)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.start(BasicWorkflowServiceImpl.java:257)
    at 
org.dspace.workflowbasic.BasicWorkflowServiceImpl.start(BasicWorkflowServiceImpl.java:58)
    at 
org.dspace.submit.step.CompleteStep.doProcessing(CompleteStep.java:90)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:155)
    at 
org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:243)
    at 
org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3237)
    at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2394)
    at 
org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:162)
    at 
org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:393)
    at 
org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2834)
    at 
org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:160)
    at org.mozilla.javascript.Context.call(Context.java:538)
    at 
org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1833)
    at 
org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1803)
    at 
org.apache.cocoon.components.flow.javascript.fom.FOM_JavaScriptInterpreter.handleContinuation(FOM_JavaScriptInterpreter.java:698)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode.invoke(CallFunctionNode.java:94)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.SelectNode.invoke(SelectNode.java:82)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.buildPipeline(ConcreteTreeProcessor.java:186)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.buildPipeline(TreeProcessor.java:260)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:107)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.SelectNode.invoke(SelectNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.buildPipeline(ConcreteTreeProcessor.java:186)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.buildPipeline(TreeProcessor.java:260)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:107)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.buildPipeline(ConcreteTreeProcessor.java:186)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.buildPipeline(TreeProcessor.java:260)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.init(SitemapSource.java:277)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.<init>(SitemapSource.java:148)
    at 
org.apache.cocoon.components.source.impl.SitemapSourceFactory.getSource(SitemapSourceFactory.java:62)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:153)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:183)
    at 
org.apache.cocoon.generation.FileGenerator.setup(FileGenerator.java:99)
    at 
org.dspace.app.xmlui.cocoon.AspectGenerator.setup(AspectGenerator.java:81)
    at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy207.setup(Unknown Source)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.setupPipeline(AbstractProcessingPipeline.java:343)
    at 
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.setupPipeline(AbstractCachingProcessingPipeline.java:710)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.preparePipeline(AbstractProcessingPipeline.java:466)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.prepareInternal(AbstractProcessingPipeline.java:480)
    at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy206.prepareInternal(Unknown Source)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.init(SitemapSource.java:292)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.<init>(SitemapSource.java:148)
    at 
org.apache.cocoon.components.source.impl.SitemapSourceFactory.getSource(SitemapSourceFactory.java:62)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:153)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:183)
    at 
org.apache.cocoon.generation.FileGenerator.setup(FileGenerator.java:99)
    at 
org.dspace.app.xmlui.cocoon.AspectGenerator.setup(AspectGenerator.java:81)
    at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy207.setup(Unknown Source)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.setupPipeline(AbstractProcessingPipeline.java:343)
    at 
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.setupPipeline(AbstractCachingProcessingPipeline.java:710)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.preparePipeline(AbstractProcessingPipeline.java:466)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.prepareInternal(AbstractProcessingPipeline.java:480)
    at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy206.prepareInternal(Unknown Source)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.init(SitemapSource.java:292)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.<init>(SitemapSource.java:148)
    at 
org.apache.cocoon.components.source.impl.SitemapSourceFactory.getSource(SitemapSourceFactory.java:62)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:153)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:183)
    at 
org.apache.cocoon.generation.FileGenerator.setup(FileGenerator.java:99)
    at 
org.dspace.app.xmlui.cocoon.AspectGenerator.setup(AspectGenerator.java:81)
    at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy207.setup(Unknown Source)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.setupPipeline(AbstractProcessingPipeline.java:343)
    at 
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.setupPipeline(AbstractCachingProcessingPipeline.java:710)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.preparePipeline(AbstractProcessingPipeline.java:466)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.prepareInternal(AbstractProcessingPipeline.java:480)
    at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy206.prepareInternal(Unknown Source)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.init(SitemapSource.java:292)
    at 
org.apache.cocoon.components.source.impl.SitemapSource.<init>(SitemapSource.java:148)
    at 
org.apache.cocoon.components.source.impl.SitemapSourceFactory.getSource(SitemapSourceFactory.java:62)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:153)
    at 
org.apache.cocoon.components.source.CocoonSourceResolver.resolveURI(CocoonSourceResolver.java:183)
    at 
org.apache.cocoon.generation.FileGenerator.setup(FileGenerator.java:99)
    at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy207.setup(Unknown Source)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.setupPipeline(AbstractProcessingPipeline.java:343)
    at 
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.setupPipeline(AbstractCachingProcessingPipeline.java:710)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.preparePipeline(AbstractProcessingPipeline.java:466)
    at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:411)
    at sun.reflect.GeneratedMethodAccessor138.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(PoolableProxyHandler.java:71)
    at com.sun.proxy.$Proxy206.process(Unknown Source)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:147)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:171)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:247)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:171)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:247)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:78)
    at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:81)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
    at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:171)
    at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:247)
    at 
org.apache.cocoon.servlet.RequestProcessor.process(RequestProcessor.java:351)
    at 
org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java:169)
    at 
org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:84)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at 
org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:468)
    at 
org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:443)
    at 
org.apache.cocoon.servletservice.spring.ServletFactoryBean$ServiceInterceptor.invoke(ServletFactoryBean.java:264)
    at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at 
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy203.service(Unknown Source)
    at org.dspace.springmvc.CocoonView.render(CocoonView.java:113)
    at 
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1216)
    at 
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1001)
    at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:867)
    at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:951)
    at 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:853)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:827)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.dspace.app.xmlui.cocoon.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:113)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.dspace.app.xmlui.cocoon.DSpaceCocoonServletFilter.doFilter(DSpaceCocoonServletFilter.java:160)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.dspace.app.xmlui.cocoon.servlet.multipart.DSpaceMultipartFilter.doFilter(DSpaceMultipartFilter.java:119)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.dspace.rdf.negotiation.NegotiationFilter.doFilter(NegotiationFilter.java:52)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
The section that referrs (i think ) is: 

Any suggestion on how to fix this problem ?  

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