# npm start error

**URL:** <https://mediasoup.discourse.group/t/npm-start-error/4886>\
**Category:** mediasoup-demo\
**Created:** [January 27, 2023, 7:19am UTC](https://mediasoup.discourse.group/t/npm-start-error/4886 "2023-01-27T07:19:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Vimala](https://avatars.discourse-cdn.com/v4/letter/v/858c86/32.png) [@Vimala](https://mediasoup.discourse.group/u/Vimala)\
**Post date:** [January 27, 2023, 7:19am UTC](https://mediasoup.discourse.group/t/npm-start-error/4886/1 "2023-01-27T07:19:27Z")

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I tried to do “npm start”

I got this error,  
mediasoup-demo-server:INFO running 12 mediasoup Workers… +0ms  
mediasoup:ERROR:Worker worker process failed [pid:undefined]: spawn C:\mediasoup-demo\server\node\_modules\mediasoup\worker\out\Release\mediasoup-worker ENOENT +0ms  
node:internal/errors:484  
ErrorCaptureStackTrace(err);  
^

Error: spawn C:\mediasoup-demo\server\node\_modules\mediasoup\worker\out\Release\mediasoup-worker ENOENT  
at ChildProcess.\_handle.onexit (node:internal/child\_process:283:19)  
at onErrorNT (node:internal/child\_process:476:16)  
at process.processTicksAndRejections (node:internal/process/task\_queues:82:21) {  
errno: -4058,  
code: ‘ENOENT’,  
syscall: ‘spawn C:\mediasoup-demo\server\node\_modules\mediasoup\worker\out\Release\mediasoup-worker’,  
path: ‘C:\mediasoup-demo\server\node\_modules\mediasoup\worker\out\Release\mediasoup-worker’,  
spawnargs: [  
‘–logLevel=warn’,  
‘–logTag=info’,  
‘–logTag=ice’,  
‘–logTag=dtls’,  
‘–logTag=rtp’,  
‘–logTag=srtp’,  
‘–logTag=rtcp’,  
‘–logTag=rtx’,  
‘–logTag=bwe’,  
‘–logTag=score’,  
‘–logTag=simulcast’,  
‘–logTag=svc’,  
‘–logTag=sctp’,  
‘–rtcMinPort=40000’,  
‘–rtcMaxPort=49999’  
]  
}

---

<div class="post-metadata">

**Author:** ![zaidiqbal](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/zaidiqbal/32/1498_2.png) [@zaidiqbal](https://mediasoup.discourse.group/u/zaidiqbal)\
**Post date:** [January 27, 2023, 9:35am UTC](https://mediasoup.discourse.group/t/npm-start-error/4886/2 "2023-01-27T09:35:00Z")

</div>

I think mediasoup is not installed properly. Did you get any error with npm install?

Make sure you have the mediasoup-worker file in this path 'C:\mediasoup-demo\server\node\_modules\mediasoup\worker\out\Release'. If it is not there, then there is some installation issue you will have to install it again, remove node\_modules and do npm install again.

If the mediasoup-worker is found in the path mentioned above then you have some permission related issue.