we are using PRPC 7.3 and when end users are trying to login they are getting following error:

Exception Details :
Caught exception: com.hazelcast.core.HazelcastInstanceNotActiveException: Hazelcast instance is not active!
com.hazelcast.spi.AbstractDistributedObject.throwNotActiveException(AbstractDistributedObject.java:104)
com.hazelcast.spi.AbstractDistributedObject.lifecycleCheck(AbstractDistributedObject.java:99)
com.hazelcast.spi.AbstractDistributedObject.getNodeEngine(AbstractDistributedObject.java:93)
com.hazelcast.spi.AbstractDistributedObject.getPartitionId(AbstractDistributedObject.java:75)
com.hazelcast.cache.impl.AbstractInternalCacheProxy.invoke(AbstractInternalCacheProxy.java:152)
com.hazelcast.cache.impl.AbstractCacheProxy.getAsync(AbstractCacheProxy.java:77)
com.hazelcast.cache.impl.CacheProxy.getAsync(CacheProxy.java:73)
com.hazelcast.cache.impl.AbstractCacheProxy.get(AbstractCacheProxy.java:157)
com.hazelcast.cache.impl.CacheProxy.get(CacheProxy.java:73)
com.hazelcast.cache.impl.CacheProxy.get(CacheProxy.java:85)
com.pega.platform.cache.internal.CacheImpl.get(CacheImpl.java:89)
com.pega.pegarules.session.internal.mgmt.util.StaticContentAGCache.get(StaticContentAGCache.java:124)
com.pegarules.generated.activity.ra_action_requestorinitialize_427d772bf9967b42fa8d887b0f447037.step17_circum0(ra_action_requestorinitialize_427d772bf9967b42fa8d887b0f447037.java:1848)
com.pegarules.generated.activity.ra_action_requestorinitialize_427d772bf9967b42fa8d887b0f447037.perform(ra_action_requestorinitialize_427d772bf9967b42fa8d887b0f447037.java:410)
com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)
com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10845)
com.pegarules.generated.activity.ra_action_applicationprofilesetup_63906a98fa068d39828a4fd059c014af.step7_circum0(ra_action_applicationprofilesetup_63906a98fa068d39828a4fd059c014af.java:609)
com.pegarules.generated.activity.ra_action_applicationprofilesetup_63906a98fa068d39828a4fd059c014af.perform(ra_action_applicationprofilesetup_63906a98fa068d39828a4fd059c014af.java:188)
com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)
com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10845)
com.pegarules.generated.activity.ra_action_applicationsetup_6373072fcfbdf7c63dcbcbd1cc37776e.step9_circum0(ra_action_applicationsetup_6373072fcfbdf7c63dcbcbd1cc37776e.java:824)
com.pegarules.generated.activity.ra_action_applicationsetup_6373072fcfbdf7c63dcbcbd1cc37776e.perform(ra_action_applicationsetup_6373072fcfbdf7c63dcbcbd1cc37776e.java:220)
com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)
com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:646)
com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(PRThreadImpl.java:481)
com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.runActivities(HttpAPI.java:3453)
com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:403)
sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1338)
com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1075)
com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:930)
com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:340)
com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(HttpAPI.java:863)
com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331)
com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274)
com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)
sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:246)
com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.invokeEngine(EngineBeanBoot.java:168)
com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.invokeEngine(Unknown Source)
com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner(JNDIEnvironment.java:278)
com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine(JNDIEnvironment.java:223)
com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(WebStandardImpl.java:678)
com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:394)
sun.reflect.GeneratedMethodAccessor95.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273)
com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121)
com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92)
javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1232)
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:781)
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:480)
com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1114)
com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:940)
com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:463)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:530)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:316)
com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)
com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1820)
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1881)
Which caused: com.pega.pegarules.pub.PRRuntimeError: PRRuntimeError
com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:712)
com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(PRThreadImpl.java:481)
com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.runActivities(HttpAPI.java:3453)
com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:403)
sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1338)
com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1075)
com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:930)
com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:340)
com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(HttpAPI.java:863)
com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331)
com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274)
com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)
sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:246)
com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.invokeEngine(EngineBeanBoot.java:168)
com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.invokeEngine(Unknown Source)
com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner(JNDIEnvironment.java:278)
com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine(JNDIEnvironment.java:223)
com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(WebStandardImpl.java:678)
com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:394)
sun.reflect.GeneratedMethodAccessor95.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
java.lang.reflect.Method.invoke(Method.java:507)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273)
com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121)
com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92)
javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1232)
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:781)
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:480)
com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1114)
com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:940)
com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:463)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:530)
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:316)
com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)
com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1820)
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1881)