Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/3098/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1248fd5f-ee73-408b-962a-12ac4fa133d7",
      "cw-e95a1465-f553-4d21-9ce4-424bc9e32b56"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8c4f70f9-591f-4572-89a5-c0c0bc7d98a7",
    "manifestId": "/api/digital_items/3098/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-e95a1465-f553-4d21-9ce4-424bc9e32b56",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/3098/2/manifest.json/",
    "canvasIndex": 0
  }
}