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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43206/105782/manifest?manifest=/json/iiif/10316.2/43206/105782/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-059bfc90-2f12-4138-bf8d-99a555ac95f7",
      "cw-e15f8942-2a9b-4d1e-9d02-59250c762d90"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d96b6b3a-3a90-455e-8533-1b05d5b8f9bd",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43206/105782/manifest?manifest=/json/iiif/10316.2/43206/105782/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-e15f8942-2a9b-4d1e-9d02-59250c762d90",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}