Html or Self-service page not coming up

This happened on a Test instance.

A user today came up with this error .
On examining the exception details which looks something like this.
Exception Details.
oracle.apps.fnd.framework.OAException: Could not load application module ‘oracle.apps.pos.supplier.server.SuppSummAM’. at oracle.apps.fnd.framework.webui.OAJSPApplicationRegistry.registerApplicationModule(OAJSPApplicationRegistry.java:279) at oracle.apps.fnd.framework.webui.OAJSPApplicationRegistry.registerApplicationModule(OAJSPApplicationRegistry.java:78) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1283) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:536) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:424) at _OA._jspService(_OA.java:212) at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:335) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:478) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:401) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:702) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:359) at com.evermind.server.http.ServletRequestDispatcher.unprivileged_forward(ServletRequestDispatcher.java:252) at com.evermind.server.http.ServletRequestDispatcher.access$100(ServletRequestDispatcher.java:42) at com.evermind.server.http.ServletRequestDispatcher$2.oc4jRun(ServletRequestDispatcher.java:186) at oracle.oc4j.security.OC4JSecurity.doPrivileged(OC4JSecurity.java:283) at com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:191) at com.evermind.server.http.EvermindPageContext.forward(EvermindPageContext.java:322) at _RF._jspService(_RF.java:225) at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:335) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:478) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:401) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64) at oracle.apps.jtf.base.session.ReleaseResFilter.doFilter(ReleaseResFilter.java:26) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15) at oracle.apps.fnd.security.AppsServletFilter.doFilter(AppsServletFilter.java:318) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:610) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:359) at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:299) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:187) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:230) at oracle.oc4j.network.ServerSocketAcceptHandler.access$800(ServerSocketAcceptHandler.java:33) at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:831) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595) ## Detail 0 ## JBO-30003: The application pool (parasaktidev.sinewloresoft.comDEVPCIL1527oracle.apps.pos.supplier.server.SuppSummAM) failed to checkout an application module due to the following exception: oracle.jbo.JboException: JBO-29000: Unexpected exception caught: oracle.apps.fnd.framework.OAException, msg=Application: FND, Message Name: FND_GENERIC_MESSAGE. Tokens: MESSAGE = java.sql.SQLException: ORA-20001: SQL_PLSQL_ERROR: N, ROUTINE, MO_GLOBAL.INIT, N, ERRNO, -20001, N, REASON, ORA-20001: APP-FND-02902: Multi-Org profile option is required. Please set either MO: Security Profile or MO: Operating Unit profile option. ORA-06512: at “APPS.FND_MESSAGE”, line 509 ORA-06512: at “APPS.MO_GLOBAL”, line 36 ORA-06512: at “APPS.MO_GLOBAL”, line 757 ORA-06512: at “APPS.MO_GLOBAL”, line 700 ORA-06512: at line 1
The highlighted part shows that the Profile options MO:Security Profile and MO:Operating Unit
need to be set correctly.
These profile options are being changed by some other user while testing.
On reverting to the relevant and appropriate values, everything went fine.