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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/69842/112773/manifest?manifest=/json/iiif/10316.2/69842/112773/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6666503f-7b97-401d-9786-69a76b77b8ea",
      "cw-f6935272-f778-4c40-9312-46cc102e874a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1730d1d0-207f-4587-af05-428f199f568a",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/69842/112773/manifest?manifest=/json/iiif/10316.2/69842/112773/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-f6935272-f778-4c40-9312-46cc102e874a",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}