# 54050: Service Instance not found

Log Level: ERROR

## Description

The specified Service Instance does not exist.

### Possible causes

* The supplied Sync Service Instance SID is erroneous.
* The requested Sync Service Instance has been deleted.

### Possible solutions

* Use the [Twilio Console](https://twilio.com/console) or the [REST API](/docs/sync/api/service) to confirm your Sync service exists.
* Make sure the Sync Service Instance SID passed in your request matches the SID of that service exactly.