Vosk Transcription service getting error -> Error while streaming audio data to transcription service

I have install jigasi. For speech to text I am using VOSK transcription service. When I click on Start Subtitles I got following error in jigasi log. No subtitles are showing in meeting.

Jigasi 2022-03-31 17:03:42.633 INFO: [72] impl.protocol.jabber.OperationSetBasicTelephonyJabberImpl.registrationStateChanged().127 Jingle : ON
Jigasi 2022-03-31 17:03:42.634 INFO: [72] org.jitsi.jigasi.JvbConference.registrationStateChanged().666 [ctx=16487246223481774217220] Registering XMPP.
Jigasi 2022-03-31 17:03:42.640 INFO: [72] impl.protocol.jabber.ProtocolProviderServiceJabberImpl.authenticated().2423 Authenticated: false
Jigasi 2022-03-31 17:03:42.645 INFO: [72] org.jitsi.jigasi.JvbConference.joinConferenceRoom().752 [ctx=16487246223481774217220] Joining JVB conference room: test-meeting@muc.webcon.bcc.gov.bd
Jigasi 2022-03-31 17:03:42.676 INFO: [77] impl.protocol.jabber.ChatRoomJabberImpl.joined().1361 test-meeting@muc.webcon.bcc.gov.bd/bfee9e72 has joined the test-meeting@muc.webcon.bcc.gov.bd chat room.
Jigasi 2022-03-31 17:03:42.855 INFO: [77] impl.protocol.jabber.ChatRoomJabberImpl.joined().1361 test-meeting@muc.webcon.bcc.gov.bd/focus has joined the test-meeting@muc.webcon.bcc.gov.bd chat room.
Jigasi 2022-03-31 17:03:42.881 SEVERE: [87] org.jitsi.jigasi.transcription.VoskTranscriptionService.log() Error while streaming audio data to transcription service
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
at org.eclipse.jetty.io.SelectorManager.doFinishConnect(SelectorManager.java:355)
at org.eclipse.jetty.io.ManagedSelector.processConnect(ManagedSelector.java:221)
at org.eclipse.jetty.io.ManagedSelector.access$1500(ManagedSelector.java:61)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.processSelected(ManagedSelector.java:533)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:395)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produceTask(EatWhatYouKill.java:357)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:181)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:748)
Jigasi 2022-03-31 17:03:42.884 SEVERE: [99] org.jitsi.jigasi.transcription.VoskTranscriptionService.log() Error while streaming audio data to transcription service
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
at org.eclipse.jetty.io.SelectorManager.doFinishConnect(SelectorManager.java:355)
at org.eclipse.jetty.io.ManagedSelector.processConnect(ManagedSelector.java:221)
at org.eclipse.jetty.io.ManagedSelector.access$1500(ManagedSelector.java:61)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.processSelected(ManagedSelector.java:533)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:395)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produceTask(EatWhatYouKill.java:357)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:181)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:748)
Jigasi 2022-03-31 17:03:43.829 INFO: [109] impl.protocol.jabber.IceUdpTransportManager.createIceAgent().347 End gathering harvester within 880 ms
Jigasi 2022-03-31 17:03:44.111 INFO: [109] impl.protocol.jabber.CallPeerMediaHandlerJabberImpl.harvestCandidates().1198 End candidate harvest within 42 ms
Jigasi 2022-03-31 17:03:44.120 INFO: [109] org.jitsi.jigasi.JvbConference.incomingCallReceived().1328 [ctx=16487246223481774217220] Got invite from focus
Jigasi 2022-03-31 17:03:44.123 INFO: [109] org.jitsi.jigasi.stats.StatsHandler.getStatsServiceWrapper().276 [ctx=16487246223481774217220] Jitsi-stats library initializing for account: Jabber:jigasi@auth.webcon.bcc.gov.bd
Jigasi 2022-03-31 17:03:44.125 WARNING: [109] org.jitsi.stats.media.StatsServiceFactory.log() KeyID/keyPath missing, will try using appSecret
Jigasi 2022-03-31 17:03:44.126 SEVERE: [109] org.jitsi.jigasi.stats.StatsHandler.error().395 [ctx=16487246223481774217220] Jitsi-stats library failed to initialize with reason: Missing parameres and error message: appSecret missing
Jigasi 2022-03-31 17:03:44.126 WARNING: [109] org.jitsi.stats.media.StatsServiceFactory.log() appSecret missing. Skipping callstats init
Jigasi 2022-03-31 17:03:44.151 SEVERE: [117] org.jitsi.jigasi.transcription.VoskTranscriptionService.log() Error while streaming audio data to transcription service
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
at org.eclipse.jetty.io.SelectorManager.doFinishConnect(SelectorManager.java:355)
at org.eclipse.jetty.io.ManagedSelector.processConnect(ManagedSelector.java:221)
at org.eclipse.jetty.io.ManagedSelector.access$1500(ManagedSelector.java:61)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.processSelected(ManagedSelector.java:533)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:395)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produceTask(EatWhatYouKill.java:357)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:181)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:748)
Jigasi 2022-03-31 17:03:44.270 INFO: [149] org.jitsi.jigasi.TranscriptionGatewaySession.log() Transcriber: Media Device Audio

Could you please help me in this issue.