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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/72050/122216/manifest?manifest=/json/iiif/10316.2/72050/122216/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a2fccaac-1152-4ff0-a58f-b08073a918fb",
      "cw-59becf11-50a7-428b-b05d-1c9db4fbb219"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b1264729-dd8f-418b-8518-5b16c2f1c5ae",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/72050/122216/manifest?manifest=/json/iiif/10316.2/72050/122216/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-59becf11-50a7-428b-b05d-1c9db4fbb219",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}