• start server in non-clustered standalone mode - bin/standalone.sh
• try accessing administration console - localhost:9990

result:
console shows error message:
An unspecified error has been recieved from server.

server log:
ERROR [org.jboss.as.controller.management-operation] (External Management Request Threads – 4) WFLYCTL0013: Operation ("read-attribute") failed - address: ([
("subsystem" => "datagrid-infinispan"),
("cache-container" => "local")
]): java.lang.NullPointerException
at org.infinispan.server.infinispan.actions.GetSitesViewAction.run(GetSitesViewAction.java:15)
at org.infinispan.server.infinispan.actions.GetSitesViewAction.run(GetSitesViewAction.java:7)
at org.infinispan.security.Security.doPrivileged(Security.java:76)
at org.infinispan.server.infinispan.SecurityActions.doPrivileged(SecurityActions.java:66)
at org.infinispan.server.infinispan.SecurityActions.getSitesView(SecurityActions.java:307)
at org.jboss.as.clustering.infinispan.subsystem.CacheContainerMetricsHandler.executeRuntimeStep(CacheContainerMetricsHandler.java:269)
at org.jboss.as.controller.AbstractRuntimeOnlyHandler$1.execute(AbstractRuntimeOnlyHandler.java:53)
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:890)
at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:659)
at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:370)
at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1344)
at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:392)
at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:217)
at org.jboss.as.domain.http.server.DomainApiHandler.handleRequest(DomainApiHandler.java:210)
at io.undertow.server.handlers.encoding.EncodingHandler.handleRequest(EncodingHandler.java:72)
at org.jboss.as.domain.http.server.security.SubjectDoAsHandler$1.run(SubjectDoAsHandler.java:72)
at org.jboss.as.domain.http.server.security.SubjectDoAsHandler$1.run(SubjectDoAsHandler.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:92)
at org.jboss.as.domain.http.server.security.SubjectDoAsHandler.handleRequest(SubjectDoAsHandler.java:68)
at org.jboss.as.domain.http.server.security.SubjectDoAsHandler.handleRequest(SubjectDoAsHandler.java:63)
at io.undertow.server.handlers.BlockingHandler.handleRequest(BlockingHandler.java:56)
at org.jboss.as.domain.http.server.DomainApiCheckHandler.handleRequest(DomainApiCheckHandler.java:95)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:207)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:802)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)