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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/97181/287088/manifest?manifest=/json/iiif/10316.2/97181/287088/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b6ffdd0c-2a3c-4f45-9da9-583dcc3804e1",
      "cw-c52efa84-4f42-429e-a0d3-df015a4c4109"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-06595274-a976-42db-b24e-72e0ff7a54af",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/97181/287088/manifest?manifest=/json/iiif/10316.2/97181/287088/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-c52efa84-4f42-429e-a0d3-df015a4c4109",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}