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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43778/107435/manifest?manifest=/json/iiif/10316.2/43778/107435/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-00da5e4b-31b6-49cd-a868-5d3c5ee69d0a",
      "cw-d4a74993-7874-415c-845c-5cc30e5ec9ab"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-440edf57-2c0e-426a-b4b0-e5741ca2d879",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43778/107435/manifest?manifest=/json/iiif/10316.2/43778/107435/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-d4a74993-7874-415c-845c-5cc30e5ec9ab",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}