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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/78995/158512/manifest?manifest=/json/iiif/10316.2/78995/158512/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-88227ef3-88d7-4336-8616-58eec9721f8b",
      "cw-e00f52b4-5337-4ca2-8b60-779d16a9576d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cd05c575-a145-4521-b764-99768246fd6c",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/78995/158512/manifest?manifest=/json/iiif/10316.2/78995/158512/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-e00f52b4-5337-4ca2-8b60-779d16a9576d",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}