I checked your web application and I think that you have many problems not only this!
I see that you are testing the DSpace CRIS version 5.5.0 please download the last stable version 5.6.1 from https://github.com/4Science/DSpace.git (https://github.com/4Science/DSpace/releases/tag/dspace-cris-5.6.1) In any case the error is related to this piece of code https://github.com/4Science/DSpace/blob/dspace-5_x_x-cris/dspace-api/src/main/java/org/dspace/content/Community.java#L343 Check your database maybe you fell into an installation issue. Please open a database console and run this query: select * from metadataschemaregistry where short_id = 'dc'; and this query: select * from metadatafieldregistry where metadata_schema_id = 1 and element = 'title' and qualifier is null; Let me know. Best, Luigi Andrea Il 21/11/2016 13:09, Vitor Rodrigues ha scritto: Hello, I got this error when i tried load the publications 2016-11-21 09:34:28,125 WARN org.dspace.app.webui.servlet.InternalErrorServlet @ :session_id=7AC3DE4A841863ADB075FC76FC3B85BA:internal_error:-- URL Was: http://200.145.5.2/simple-search?query=&location=publications -- Method: GET -- Parameters were: -- query: "" -- location: "publications" java.lang.NullPointerException at org.dspace.content.Community.findAllTop(Community.java:343) at org.dspace.app.webui.discovery.DiscoverySearchRequestProcessor.doSimpleSearch(DiscoverySearchRequestProcessor.java:258) at org.dspace.app.webui.servlet.SimpleSearchServlet.doDSGet(SimpleSearchServlet.java:63) at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:119) at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:67) at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.dspace.app.webui.cris.filter.ExploreLocationFilter.doFilter(ExploreLocationFilter.java:88) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:221) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:190) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) 2016-11-21 09:50:38,972 INFO org.dspace.browse.BrowseEngine @ anonymous:session_id=30DDC7A7C7BE1EE762D0071E2232C74F:ip_addr=130.211.177.74:browse_mini: 2016-11-21 09:50:38,986 INFO org.dspace.app.webui.discovery.DiscoverUtility @ facets for scope, null: 1 -- You received this message because you are subscribed to the Google Groups "DSpace Technical Support" group. 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