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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/42936/104798/manifest?manifest=/json/iiif/10316.2/42936/104798/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7c2f8615-4385-4b37-a742-318152b44ba0",
      "cw-3e46da91-af9c-4b6e-94b3-e0d91b73d0d0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4e6dd6ff-158f-4cb3-a23c-3bcac699d330",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/42936/104798/manifest?manifest=/json/iiif/10316.2/42936/104798/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-3e46da91-af9c-4b6e-94b3-e0d91b73d0d0",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}