Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/125722/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a8f2e661-ac55-4b65-b144-7574fd439c0d",
      "cw-07e6021f-c354-41df-afc2-af1fe07cfafd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-aabdfecd-4436-4e5f-b9ff-dbb8d9b15c4a",
    "manifestId": "/api/digital_items/125722/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-07e6021f-c354-41df-afc2-af1fe07cfafd",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/125722/2/manifest.json/",
    "canvasIndex": 0
  }
}