Мірадор - viewer

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

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "/api/digital_items/80554/2/manifest.json/",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4f0908cc-1cb1-4a83-bb68-1c74878c8071",
      "cw-c61d44f3-acf1-453f-99bb-51d89d01f768"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-257b944c-f29f-4bb1-8500-84c6312e13f4",
    "manifestId": "/api/digital_items/80554/2/manifest.json/",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "annotations",
    "thumbnailNavigationId": "cw-c61d44f3-acf1-453f-99bb-51d89d01f768",
    "thumbnailNavigationPosition": "off",
    "loadedManifest": "/api/digital_items/80554/2/manifest.json/",
    "canvasIndex": 0
  }
}