CONFERENCE FAILED: conference.videobridgeNotAvailable when more than 1 user is connected

hello.
Please i need urgently some help.
I follow some instructions on jitsi website to install fresh jitsi version on my server.
everything is ok.
But when more than users are connected in the same room, every user become disconnected immediately…
I receive this message from console web ("[conference.js] <te._onConferenceFailed>: CONFERENCE FAILED: conference.videobridgeNotAvailable")

this is my website https://joinhealth-vconnect.liveboxcloud.com/

Please help me …

/etc/jitsi/jicofo# tail -f /var/log/jitsi/jvb.log
at org.jitsi.meet.ComponentMain.lambda$getConnectCallable$0(ComponentMain.java:286)
at org.jitsi.retry.RetryStrategy$TaskRunner.run(RetryStrategy.java:193)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
JVB 2020-07-22 19:14:10.515 INFO: [15] org.jitsi.videobridge.VideobridgeExpireThread.log() Running expire()
JVB 2020-07-22 19:14:12.122 SEVERE: [16] org.jitsi.videobridge.health.Health.log() Health check failed in 0ms:
java.lang.Exception: No XMPP components
at org.jitsi.videobridge.health.Health.checkXmppConnection(Health.java:269)
at org.jitsi.videobridge.health.Health.doCheck(Health.java:225)
at org.jitsi.videobridge.health.Health.doRun(Health.java:495)
at org.jitsi.utils.concurrent.PeriodicRunnableWithObject.run(PeriodicRunnableWithObject.java:87)
at org.jitsi.utils.concurrent.RecurringRunnableExecutor.run(RecurringRunnableExecutor.java:216)
at org.jitsi.utils.concurrent.RecurringRunnableExecutor.runInThread(RecurringRunnableExecutor.java:292)
at org.jitsi.utils.concurrent.RecurringRunnableExecutor.access$000(RecurringRunnableExecutor.java:36)
at org.jitsi.utils.concurrent.RecurringRunnableExecutor$1.run(RecurringRunnableExecutor.java:328)
JVB 2020-07-22 19:14:13.126 SEVERE: [29] org.jitsi.meet.ComponentMain.log() host-unknown, host:localhost, port:5347
org.xmpp.component.ComponentException: host-unknown
at org.jivesoftware.whack.ExternalComponent.connect(ExternalComponent.java:243)
at org.jivesoftware.whack.ExternalComponentManager.addComponent(ExternalComponentManager.java:242)
at org.jivesoftware.whack.ExternalComponentManager.addComponent(ExternalComponentManager.java:222)
at org.jitsi.meet.ComponentMain.lambda$getConnectCallable$0(ComponentMain.java:286)
at org.jitsi.retry.RetryStrategy$TaskRunner.run(RetryStrategy.java:193)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)