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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/77804/153994/manifest?manifest=/json/iiif/10316.2/77804/153994/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0cae2470-cdf4-46c7-a851-fd0998610c89",
      "cw-5bc33b66-0c11-4f6e-a8a1-1c8afda617cd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6fbd03cf-d442-4770-bd67-82c6c7859492",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/77804/153994/manifest?manifest=/json/iiif/10316.2/77804/153994/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-5bc33b66-0c11-4f6e-a8a1-1c8afda617cd",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}