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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/69551/111581/manifest?manifest=/json/iiif/10316.2/69551/111581/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-20a0b5f5-981a-4ef8-af55-40b9c23a1ab5",
      "cw-46c9e0eb-9876-4d51-b793-383a1d0a43a1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-97c9225c-2082-4a68-b50e-5834506d436e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/69551/111581/manifest?manifest=/json/iiif/10316.2/69551/111581/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-46c9e0eb-9876-4d51-b793-383a1d0a43a1",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}