Мірадор - viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/2442/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bccae41a-1811-476a-aceb-6a3d30763c00",
      "cw-b3bcaf9d-4681-4ff2-9fc6-4855b334bdcb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cdefd1d1-58e2-4ea3-b08c-8a230f665cd3",
    "manifestId": "/api/digital_items/2442/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-b3bcaf9d-4681-4ff2-9fc6-4855b334bdcb",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/2442/2/manifest.json/",
    "canvasIndex": 0
  }
}