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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72259/123052/manifest?manifest=/json/iiif/10316.2/72259/123052/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ed3d5ed3-c315-4e8d-a899-b5c873a05ca5",
      "cw-33bbbd4b-5c94-4a99-9577-eb454ceff827"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-40e66ea9-eab7-4c5b-8f69-c67b81bdb0d7",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72259/123052/manifest?manifest=/json/iiif/10316.2/72259/123052/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-33bbbd4b-5c94-4a99-9577-eb454ceff827",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}