# Start session error kurento

**URL:** <https://openvidu.discourse.group/t/start-session-error-kurento/276>\
**Category:** Issues developing apps\
**Tags:** v2\
**Created:** [March 19, 2020, 11:32pm UTC](https://openvidu.discourse.group/t/start-session-error-kurento/276 "2020-03-19T23:32:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![melvingilberto](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/melvingilberto/32/25_2.png) [@melvingilberto](https://openvidu.discourse.group/u/melvingilberto)\
**Post date:** [March 19, 2020, 11:32pm UTC](https://openvidu.discourse.group/t/start-session-error-kurento/276/1 "2020-03-19T23:32:21Z")

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On occasions when I start a class the system returns the following error:  
ERROR: [KurentoClient] Exception connecting to WebSocket server ws: // localhost: 8888 / kurento. Code: 204 in Request: method: joinRoom params: {My data}  
request: undefined

and I have to restart openvidu and kurento, do you know why?  
openvidu 2.11.0

En ocaciones cuando inicio una clase el sistema me retorna el siguiente error:  
ERROR:[KurentoClient] Exception connecting to WebSocket server ws://localhost:8888/kurento. Code: 204 in Request: method:joinRoom params: {My data}  
request:undefined

y tengo que reiniciar openvidu y kurento, saben a que se debe?

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**Author:** ![micael.gallego](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/micael.gallego/32/2_2.png) [@micael.gallego](https://openvidu.discourse.group/u/micael.gallego)\
**Post date:** [March 20, 2020, 10:54pm UTC](https://openvidu.discourse.group/t/start-session-error-kurento/276/2 "2020-03-20T22:54:48Z")

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Please use 2.12 version as we have improved KMS stabillity and reduced crashes.