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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43849/107666/manifest?manifest=/json/iiif/10316.2/43849/107666/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-42c1a547-c739-4b1a-9e7c-43195ba6f30f",
      "cw-295b8274-5256-4a50-8a33-205ca3a753b8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f1f7c95e-e001-4834-a334-efe658a2102e",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43849/107666/manifest?manifest=/json/iiif/10316.2/43849/107666/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-295b8274-5256-4a50-8a33-205ca3a753b8",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}