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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/78730/157731/manifest?manifest=/json/iiif/10316.2/78730/157731/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6fd058a7-927b-4b70-b240-b949d02073e5",
      "cw-f6c2d618-e099-499a-8b8d-14dc1859dab6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c75f9b60-2d89-4660-9208-57b12817168e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/78730/157731/manifest?manifest=/json/iiif/10316.2/78730/157731/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-f6c2d618-e099-499a-8b8d-14dc1859dab6",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}