type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.NullPointerException org.greenstone.gsdl3.util.GSPath.appendLink(GSPath.java:38) org.greenstone.gsdl3.action.DocumentAction.getBackgroundData(DocumentAction.java:719) org.greenstone.gsdl3.action.DocumentAction.process(DocumentAction.java:130) org.greenstone.gsdl3.core.Receptionist.process(Receptionist.java:253) org.greenstone.gsdl3.LibraryServlet.doGetOrPost(LibraryServlet.java:783) org.greenstone.gsdl3.LibraryServlet.doGet(LibraryServlet.java:812) javax.servlet.http.HttpServlet.service(HttpServlet.java:620) javax.servlet.http.HttpServlet.service(HttpServlet.java:727) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.greenstone.gsdl3.core.URLFilter.doFilter(URLFilter.java:404)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.57 logs.