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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/43703/107274/manifest?manifest=/json/iiif/10316.2/43703/107274/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-882e88dc-1f59-47d1-b944-3af06aceb711",
      "cw-375a0323-ef47-42b8-9acf-26b622f82089"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-379bc192-2170-4e1b-8fdb-7e027d0f226c",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/43703/107274/manifest?manifest=/json/iiif/10316.2/43703/107274/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-375a0323-ef47-42b8-9acf-26b622f82089",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}