Getting "Unexpected Error: NULL"

[prutheel]

I have added websocket sampler in the Jmeter with all the dependencies.

In my recorded script I have put the Websocket sampler after the HTTP request:

https://example.server.com/socket.io/1/?t=${timestamp}
I am getting the response like -
"TSiJ56ESavsfGEQcsBj9:17:60:websocket,xhr-polling,htmlfile,jsonp-polling". So from that I am extracting the socket id/connection id i.e first 20 alphabets and passing in the WSS connection id.
In websocket sampler I am providing following Parameter
path: socket.io/1/websocket/${socid}
connestion id: ${socid}
Response pattern: *Blank
Close connection: *Blank
Request data: 5:::{"name":"join","args":["Ag_1250","${GUID}"]}

But while executing the Script getting this error
[Execution Flow]

• Opening new connection
• Using response message pattern ""
• Using disconnect pattern ""

[Problems]

• Unexpected error: null
  JMeter.plugins.functional.samplers.websocket.ServiceSocket.sendMessage(ServiceSocket.java:131)
  JMeter.plugins.functional.samplers.websocket.WebSocketSampler.sample(WebSocketSampler.java:102)
  org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)
  org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
  java.lang.Thread.run(Unknown Source)

I am not sure whether I am using the Websocket in correct way or not. So kindly help me on this

[pontiyaraja]

Please use new version of jar. I too faced the same issue and resolved

[prutheel]

Can you please tell me where I can download latest set of JARs? I have downloaded version of 9.1.1...something. That are mentioned in the Dependencies List of this Page

[4M01]

Hi @pontiyaraja,
which version of JARs, would you be please specific?