# npm start fail ,not find createWebRtcServer

**URL:** <https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579>\
**Category:** mediasoup-demo\
**Created:** [September 19, 2022, 9:14am UTC](https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579 "2022-09-19T09:14:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![liutao-lx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/liutao-lx/32/1756_2.png) [@liutao-lx](https://mediasoup.discourse.group/u/liutao-lx)\
**Post date:** [September 19, 2022, 9:14am UTC](https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579/1 "2022-09-19T09:14:36Z")

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When I started npm, I found that，

/usr/local/mediasoup-demo/server/server.js:133  
const webRtcServer = await worker.createWebRtcServer(webRtcServerOptions);  
^

TypeError: worker.createWebRtcServer is not a function  
at runMediasoupWorkers (/usr/local/mediasoup-demo/server/server.js:133:38)  
at processTicksAndRejections (node:internal/process/task\_queues:96:5)  
at async run (/usr/local/mediasoup-demo/server/server.js:69:2)

could you tell me whether I failed to compile or what the reason is?

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**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [September 19, 2022, 10:04am UTC](https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579/2 "2022-09-19T10:04:18Z")

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You are not using last mediasoup version probably

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<div class="post-metadata">

**Author:** ![liutao-lx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/liutao-lx/32/1756_2.png) [@liutao-lx](https://mediasoup.discourse.group/u/liutao-lx)\
**Post date:** [September 21, 2022, 3:12am UTC](https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579/3 "2022-09-21T03:12:20Z")

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thanks，I successfully deployed。

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<div class="post-metadata">

**Author:** ![rajat-gith](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/rajat-gith/32/2228_2.png) [@rajat-gith](https://mediasoup.discourse.group/u/rajat-gith)\
**Post date:** [July 4, 2023, 4:57am UTC](https://mediasoup.discourse.group/t/npm-start-fail-not-find-createwebrtcserver/4579/4 "2023-07-04T04:57:32Z")

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Great you successfully deployed can please help me with this I am facing the similar issue.