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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72581/124370/manifest?manifest=/json/iiif/10316.2/72581/124370/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-24fedd4e-5a18-452c-87e0-7a5d498894a6",
      "cw-b591efd8-75fe-447b-8844-af663d27341d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fb14ab83-0bfa-4fa9-83d5-282d8713eba0",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72581/124370/manifest?manifest=/json/iiif/10316.2/72581/124370/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-b591efd8-75fe-447b-8844-af663d27341d",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}