API error help (java.lang.NullPointerException)

OpenVidu v2 Issues developing apps
1

I use openvidu 2.20.0

I try websocket connect.
websocket URL : wss://“domain address”/openvidu
result : websocket is open

ErrorMessage :
{“id”:4,“error”:{“code”:-1,“message”:“java.lang.NullPointerException:null”,“data”:“java.lang.NullPointerException\n\tat io.openvidu.server.core.Session.registerPublisher(Session.java:156)\n\tat io.openvidu.server.kurento.core.KurentoSession.newPublisher(KurentoSession.java:96)\n\tat io.openvidu.server.kurento.core.KurentoSessionManager.publishVideo(KurentoSessionManager.java:495)\n\tat io.openvidu.server.rpc.RpcHandler.publishVideo(RpcHandler.java:343)\n\tat io.openvidu.server.rpc.RpcHandler.handleRequest(RpcHandler.java:125)\n\tat org.kurento.jsonrpc.internal.JsonRpcHandlerManager.handleRequest(JsonRpcHandlerManager.java:142)\n\tat org.kurento.jsonrpc.internal.server.ProtocolManager$3.run(ProtocolManager.java:218)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\n\tat java.base/java.lang.Thread.run(Thread.java:829)\n”},“jsonrpc”:“2.0”}

How fix it?

2

I don’t mean to revive this old thread but I have the same issue as you.
You mentioned in https://openvidu.discourse.group/t/joinroom-message-question/3826 that you found a solution for this error. Would you mind sharing it here?