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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72273/123108/manifest?manifest=/json/iiif/10316.2/72273/123108/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-11366efd-f96c-4117-8fcc-59c59cd2f2b9",
      "cw-7e01ec37-6ff5-4b26-b2ca-33aa69d514b4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c0d2666a-b5fc-48f0-b318-16ec39e65f77",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72273/123108/manifest?manifest=/json/iiif/10316.2/72273/123108/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-7e01ec37-6ff5-4b26-b2ca-33aa69d514b4",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}