# 57021: Token invalid

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio returns this error when the request includes an invalid token. Send a valid token before retrying the request.

### Possible causes

* The token in the request is invalid.

### Possible solutions

* Replace the token with a valid value and send the request again.

#### Additional resources

* [Debugging Your Twilio Application](/docs/usage/troubleshooting/debugging-your-application)
* [Twilio API requests](/docs/usage/requests-to-twilio)