# 16030: Participant failed to be added to the conference

Log Type: TWILIO

Log Level: ERROR

## Description

Twilio encountered an unexpected internal error while attempting to add a participant to an active conference.

### Possible causes

* Twilio hit an internal error while processing the request to add the participant to the conference.

### Possible solutions

* Retry the request later. Twilio identifies this as an internal error and recommends trying again.
* If you create participants with `ConferenceSid`, make sure the conference is active before you send the request; if the specified conference is not active, the request fails.

#### Additional resources

* [Conferences Participants subresource](/docs/voice/api/conference-participant-resource)
* [TwiML `<Conference>`](/docs/voice/twiml/conference)