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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/73421/128439/manifest?manifest=/json/iiif/10316.2/73421/128439/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f11b7c49-0b57-4fce-bace-817330babe57",
      "cw-ec26ca28-2546-4485-9dda-3b57c42838f7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6526dfce-1d78-4f09-b8d0-511879af9e1a",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/73421/128439/manifest?manifest=/json/iiif/10316.2/73421/128439/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-ec26ca28-2546-4485-9dda-3b57c42838f7",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}