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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43331/106158/manifest?manifest=/json/iiif/10316.2/43331/106158/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-de262d70-b367-4660-b320-f2bcb82cc0f6",
      "cw-a44b9d65-4fd1-40c2-81b9-82c0722c95b2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f9032fa9-a98b-4874-8bec-b0d6cee00c74",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43331/106158/manifest?manifest=/json/iiif/10316.2/43331/106158/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-a44b9d65-4fd1-40c2-81b9-82c0722c95b2",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}