# InvalidStateError: not loaded

**URL:** <https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324>\
**Category:** mediasoup libraries\
**Created:** [September 20, 2021, 3:49pm UTC](https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324 "2021-09-20T15:49:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anon19094649](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@anon19094649](https://mediasoup.discourse.group/u/anon19094649)\
**Post date:** [September 20, 2021, 3:49pm UTC](https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324/1 "2021-09-20T15:49:57Z")

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I have encountered an error and I have no clue what it means. This seams to be the offending code, I checked the docs and I don’t understand why this would not work but throw an error.  
`InvalidStateError: not loaded`

```auto
this.consumerTransport = this.device.createRecvTransport(this.consumerParams);
this.consumerTransport.on('connect', async ({ dtlsParameters }, callback) => {
    // connect
    await this.socket.emit('transportConsumeInit', {
        dtlsParameters,
    })
    callback()
});``
```

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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 20, 2021, 5:09pm UTC](https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324/3 "2021-09-20T17:09:53Z")

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> [@anon19094649](#):
>
> I have encountered an error and I have no clue what it means

Reading the documentation usually helps:

> **[mediasoup :: Communication Between Client and Server](https://mediasoup.org/documentation/v3/communication-between-client-and-server/#device-loading)**
>
> Cutting Edge WebRTC Video Conferencing

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<div class="post-metadata">

**Author:** ![chenzx](https://avatars.discourse-cdn.com/v4/letter/c/ee59a6/32.png) [@chenzx](https://mediasoup.discourse.group/u/chenzx)\
**Post date:** [December 1, 2021, 12:01pm UTC](https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324/4 "2021-12-01T12:01:48Z")

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Hi,

I had this error when using firefox as webrtc transport consumer, & chrome is fine(no error).  
& then i put mediasoup server script to run inside docker(on Mac), chrome is also blocking.  
I re-checked the documeentation, nothing missed.

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<div class="post-metadata">

**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:** [December 1, 2021, 12:15pm UTC](https://mediasoup.discourse.group/t/invalidstateerror-not-loaded/3324/5 "2021-12-01T12:15:57Z")

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Please avoid direct mentions.