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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/160028/412535/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f322a7cd-d370-4d2e-b1ef-a4ded737c3f0",
      "cw-0cabcea5-87d5-4b80-bb5f-436e962c777a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4a154c78-c84e-46ac-b3c2-669b3bb94e32",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/160028/412535/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-0cabcea5-87d5-4b80-bb5f-436e962c777a",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}