Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/127253/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-da0cfe1e-5c45-4c45-8c30-493ffca9ea28",
      "cw-5f3e6978-1d6e-493d-ac6c-acd9e11f9339"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a08a1adf-b2a7-4a75-b628-dfa6bd8c2cea",
    "manifestId": "/api/digital_items/127253/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-5f3e6978-1d6e-493d-ac6c-acd9e11f9339",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/127253/2/manifest.json/",
    "canvasIndex": 0
  }
}