> Portal Navigation:
> 
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> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
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> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

# Method name:

siteRealtime.onError(handler: ErrorHandler)

# Method Link:

https://dev.wix.com/docs/frontend-modules/frontend-modules/site-realtime/on-error.md

# Method Description:

Adds an event handler that runs when an error occurs.

An error can occur when attempting to resubscribe after a disconnection.
 Errors that occur during the initial subscription process cause the
 Promise returned by the [`subscribe()`](#subscribe) function to reject
 and do not trigger `onError()` event handlers.

# Method Permissions:



# Method Permissions Scopes IDs:

undefined



# Method Code Examples:

## Add an error handler

```javascript
import { realtime } from '@wix/site-realtime';

// ...

realtime.onError( (error) => {
  let code = error.errorCode;
  let message = error.message;
  if(error.channel) {
    let channelName = error.channel.name;
    let resourceId = error.channel.resourceId;
  }
} );
```