# 16010: Conference Event: Internal Twilio Error

Log Level: ERROR

## Description

Twilio encountered an internal error while processing a conference event for a `Conference`. When you set `statusCallbackEvent`, Twilio sends conference state-change webhooks to the `statusCallback` URL, and you can review fired events in the conference logs in the Console.

### Possible causes

* Twilio hit a transient internal service error while generating or delivering the conference event.
* Twilio attempted to send the event to the `statusCallback` URL for a conference that was configured to emit conference events, but the webhook request failed before it could be delivered.

### Possible solutions

* Retry the request later. Twilio internal errors can be transient.
* Check the conference logs in the Console to confirm which event fired and when it failed.
* Check the error logs for the exact error, potential causes, suggested solutions, and the HTTP request and response associated with the webhook request.
* Open the `statusCallback` URL in your browser and verify the endpoint responds without errors.
* Make sure the callback URL does not return an HTTP `301` or `302` redirect. Twilio follows redirects, but it will not include the original parameters on the follow-up request.

#### Additional resources

* [TwiML `<Conference>`](/docs/voice/twiml/conference)
* [Debugging Your Twilio Application](/docs/usage/troubleshooting/debugging-your-application)