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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/42969/104832/manifest?manifest=/json/iiif/10316.2/42969/104832/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-14648698-8b56-4578-9096-98627f98f00b",
      "cw-cf2e6781-3aa8-49d8-86ca-7a56f3ce7103"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3dafd528-6e08-4332-ac8f-29b607172ecd",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/42969/104832/manifest?manifest=/json/iiif/10316.2/42969/104832/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-cf2e6781-3aa8-49d8-86ca-7a56f3ce7103",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}