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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/73458/128589/manifest?manifest=/json/iiif/10316.2/73458/128589/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-138d482b-f902-4603-821a-083a6a3b8bce",
      "cw-22e53508-33c1-40f7-a77a-4b8bb347da07"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2649abb3-2972-4eb6-acf0-0cd6287e3ccd",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/73458/128589/manifest?manifest=/json/iiif/10316.2/73458/128589/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-22e53508-33c1-40f7-a77a-4b8bb347da07",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}