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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71959/121852/manifest?manifest=/json/iiif/10316.2/71959/121852/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8f669aef-31c4-4409-8b61-8952d153d8c6",
      "cw-3b80c340-bb6d-4a91-a042-a746954edbdb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d4450624-18fe-447e-8597-b06b46c51777",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71959/121852/manifest?manifest=/json/iiif/10316.2/71959/121852/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-3b80c340-bb6d-4a91-a042-a746954edbdb",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}