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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72139/122572/manifest?manifest=/json/iiif/10316.2/72139/122572/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-caf4af19-b87d-440b-9213-b7970e41a96e",
      "cw-fa09077f-c504-4b75-a194-c5850ddbe868"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-11edc069-6119-4216-9328-1a1735b798f5",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72139/122572/manifest?manifest=/json/iiif/10316.2/72139/122572/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-fa09077f-c504-4b75-a194-c5850ddbe868",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}