OA Exception FND Generic Message

We are using EBS version 12.2.4

When I login to the instance and go to the XML Publisher Administrator responsibility and click on Home and Template, it generates an error. How should I go about the troubleshoot this error? Please advise. Thank you.

Exception Details.

oracle.apps.fnd.framework.OAException: Application: FND, Message Name: FND_GENERIC_MESSAGE. Tokens: MESSAGE = java.sql.SQLException: Connection has already been closed.; at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:912) at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(OAPageErrorHandler.java:1169) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:2255) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:567) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:455) at _pages.__oa._jspService(__oa.java:233) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at weblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:159) at _pages.__rf._jspService(__rf.java:239) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.fnd.security.WLFilter.doFilter(WLFilter.java:213) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.jtf.cabo.interceptor.JTFWrapperFilter.doFilter(JTFWrapperFilter.java:141) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.jtf.base.session.ReleaseResFilter.doFilter(Unknown Source) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.fnd.security.AppsServletFilter.doFilter(AppsServletFilter.java:432) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119) at java.security.AccessController.doPrivileged(Native Method) at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315) at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442) at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103) at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171) at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3739) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3705)