no list of workgroups

[f1-outsourcing]

http://192.168.122.248:8080/webchat/

List of available workgroups within Fastpath
Click on one of the following workgroups to join.

<empty>

Jul 12, 2019 10:40:48 PM org.jivesoftware.webchat.util.WebLog log
INFO: Presence packets :
Jul 12, 2019 10:40:53 PM org.jivesoftware.webchat.util.WebLog logError
WARNING: Workgroup is not available: "demo@workgroup.192.168.122.250" : No response received within reply timeout. Timeout was 5000ms (~5s). Waited for response using: AndFilter: (FromMatchesFilter (ignoreResourcepart): demo@workgroup.192.168.122.250, StanzaTypeFilter: Presence).
Jul 12, 2019 10:40:53 PM org.jivesoftware.webchat.util.WebLog logError
WARNING: Could not retrieve image: offline
org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error reply received from demo@workgroup.192.168.122.250: XMPPError: service-unavailable - cancel
at org.jivesoftware.smack.XMPPException$XMPPErrorException.ifHasErrorThenThrow(XMPPException.java:132)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:263)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:214)
at org.jivesoftware.smackx.workgroup.user.Workgroup.getChatSettings(Workgroup.java:659)
at org.jivesoftware.smackx.workgroup.user.Workgroup.getChatSettings(Workgroup.java:635)
at org.jivesoftware.webchat.util.SettingsManager.getImage(SettingsManager.java:154)
at org.jivesoftware.webchat.FastpathServlet.service(FastpathServlet.java:183)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.jivesoftware.webchat.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:45)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.jivesoftware.webchat.SetupFilter.doFilter(SetupFilter.java:92)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)

webchat container environment:
openjdk-8, tomcat-8, webchat 4.2.0-snapshot
openfire container environment:
openjdk-8, openfire-4.3.2