Failed to render block

Block name: horseHeroBanner

Error:

{
  "status": 502,
  "details": [
    {
      "code": "custom",
      "message": "entry is referencing an unpublish entry",
      "path": [
        "horse",
        0
      ]
    }
  ],
  "message": "Validation Error"
}

Failed to render block

Block name: breadcrumbs

Error:

{
  "status": 502,
  "details": [
    {
      "code": "invalid_type",
      "expected": "string",
      "received": "undefined",
      "path": [
        "slug"
      ],
      "message": "Required"
    }
  ],
  "message": "Validation Error"
}