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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43332/106159/manifest?manifest=/json/iiif/10316.2/43332/106159/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7edaa1f0-3927-4b99-91e8-dc6569e14dce",
      "cw-fb3c0869-5934-40d6-b7ba-1b15973470fe"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ca219b24-35f3-4438-80f3-a7fedebfbefe",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43332/106159/manifest?manifest=/json/iiif/10316.2/43332/106159/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-fb3c0869-5934-40d6-b7ba-1b15973470fe",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}