# Error cannot read connection

**URL:** <https://openvidu.discourse.group/t/error-cannot-read-connection/936>\
**Category:** Issues developing apps\
**Tags:** v2\
**Created:** [May 23, 2020, 5:14am UTC](https://openvidu.discourse.group/t/error-cannot-read-connection/936 "2020-05-23T05:14:15Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ankit\_Bhardwaj](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/ankit_bhardwaj/32/468_2.png) [@Ankit\_Bhardwaj](https://openvidu.discourse.group/u/Ankit_Bhardwaj)\
**Post date:** [May 23, 2020, 5:14am UTC](https://openvidu.discourse.group/t/error-cannot-read-connection/936/1 "2020-05-23T05:14:15Z")

</div>

app3.js:32 Uncaught TypeError: Cannot read property ‘connection’ of undefined  
at app3.js:32  
at EventEmitter.arrowHandler (EventDispatcher.ts:81)  
at EventEmitter.emitEvent (EventEmitter.js:394)  
at Subscriber.StreamManager.on (StreamManager.ts:158)  
at app3.js:29  
at EventEmitter.arrowHandler (EventDispatcher.ts:81)  
at EventEmitter.emitEvent (EventEmitter.js:394)  
at Session.ts:1166  
at Array.forEach ()  
at Session.ts:1165

---

<div class="post-metadata">

**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:** [May 23, 2020, 7:29am UTC](https://openvidu.discourse.group/t/error-cannot-read-connection/936/2 "2020-05-23T07:29:14Z")

</div>

Can you describe when this error appear?

Can you reproduce it with some tutorial?

---

<div class="post-metadata">

**Author:** ![Ankit\_Bhardwaj](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/ankit_bhardwaj/32/468_2.png) [@Ankit\_Bhardwaj](https://openvidu.discourse.group/u/Ankit_Bhardwaj)\
**Post date:** [May 23, 2020, 6:33pm UTC](https://openvidu.discourse.group/t/error-cannot-read-connection/936/3 "2020-05-23T18:33:06Z")

</div>

i m using same inseure-js

when joining session error coming  
Failed to load resource: the server responded with a status of 409 ()

---

<div class="post-metadata">

**Author:** ![CSantosM](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/csantosm/32/16_2.png) [@CSantosM](https://openvidu.discourse.group/u/CSantosM)\
**Post date:** [May 23, 2020, 6:46pm UTC](https://openvidu.discourse.group/t/error-cannot-read-connection/936/4 "2020-05-23T18:46:32Z")

</div>

Everything is in the docs

[https://docs.openvidu.io/en/2.14.0/reference-docs/REST-API/#post-apisessions](https://docs.openvidu.io/en/2.14.0/reference-docs/REST-API/#post-apisessions)