# 21654: ContentSid Required

Log Type: APPLICATION

Log Level: ERROR

## Description

A ContentSid must be specified if ContentVariables are provided in the request.

### Possible causes

You attempted to send a message with the ContentVariables parameter but without ContentSid.

### Possible solutions

Please provide a ContentSid when the request includes the ContentVariables parameter. Review [this documentation](/docs/content/send-templates-created-with-the-content-template-builder) for how to send Content Templates.