Invalid expand

{
  "type": "https://docs.get-exo.com/errors/invalid_expand",
  "title": "Invalid expand",
  "status": 422,
  "detail": "Unknown expand relation(s): sources.body. Valid values: sources.content.",
  "code": "invalid_expand",
  "requestId": "req_9f2c41ab7d0e5c18",
  "suggestedAction": "Request only supported relations: sources.content. Omit expand entirely to get the lean response.",
  "errors": [
    {
      "pointer": "#/expand",
      "field": "expand",
      "code": "unknown_expand_relation",
      "message": "'sources.body' is not an expandable relation on this route."
    }
  ]
}