Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/149493/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2c1081d4-c7dc-469e-871d-2f9122059baf",
      "cw-6e697f80-7b5b-4037-bff5-cd4b1137ee26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-50c37e58-9d99-4456-9ccc-f646e79a9c45",
    "manifestId": "/api/digital_items/149493/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-6e697f80-7b5b-4037-bff5-cd4b1137ee26",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/149493/2/manifest.json/",
    "canvasIndex": 0
  }
}