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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72146/122600/manifest?manifest=/json/iiif/10316.2/72146/122600/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c5b76ecc-7b6f-4461-8205-7331060c1fd2",
      "cw-71f038cc-65e7-4da1-a73b-492c736b30b7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7d7d137d-a884-4303-802d-5e3dea4b42e9",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72146/122600/manifest?manifest=/json/iiif/10316.2/72146/122600/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-71f038cc-65e7-4da1-a73b-492c736b30b7",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}