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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71800/121216/manifest?manifest=/json/iiif/10316.2/71800/121216/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4393f1d1-2db6-4637-b880-62b0e4e2cf51",
      "cw-7d0e5f60-90d4-4077-b3bd-1ea85ef25aa4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-32953c4f-1e4e-4881-8682-7210d074a42d",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71800/121216/manifest?manifest=/json/iiif/10316.2/71800/121216/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-7d0e5f60-90d4-4077-b3bd-1ea85ef25aa4",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}