Adapter Engine not visible in RWB

Hi Guys,
         I coudnt find the Adapter engine in Component Monitoring and Message monitoring in RWB.
while displaying the components of Integration Engine getting the below error. I am using PI 7.1
Kindly let me know where to check if the components are not visible in RWB.
java.lang.NullPointerException:
     at com.sap.aii.mdt.web.MonitorDynPage.setNewComponent(MonitorDynPage.java:635)
     at com.sap.aii.mdt.web.MonitorDynPage.process_go_button(MonitorDynPage.java:496)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sapportals.htmlb.page.DynPage.doProcessCurrentEvent(DynPage.java:172)
     at com.sapportals.htmlb.page.PageProcessor.handleRequest(PageProcessor.java:102)
     at com.sapportals.htmlb.page.PageProcessorServlet.handleRequest(PageProcessorServlet.java:62)
     at com.sapportals.htmlb.page.PageProcessorServlet.doPost(PageProcessorServlet.java:22)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:66)
     at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:32)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:431)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:289)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:376)
     at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:85)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:160)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:67)
     at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)
     at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)
     at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)
     at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
     at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
     at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:295)
     at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.run(Processor.java:222)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:152)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:247)
With Regards
Pradeep N

Check page 129 of this document:
[SAP XI TroubleShooting Guide|https://websmp109.sap-ag.de/~form/sapnet?_SHORTKEY=01100035870000659947&_OBJECT=011000358700005909032005E]

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