Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/127256/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-af6328df-354a-4b9d-b722-b74ef919db4f",
      "cw-313be8aa-cfd7-42b9-a399-33ec12c65141"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-bb82b403-e17e-40a6-bba5-e96db8c0a7d5",
    "manifestId": "/api/digital_items/127256/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-313be8aa-cfd7-42b9-a399-33ec12c65141",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/127256/2/manifest.json/",
    "canvasIndex": 0
  }
}