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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/71724/120912/manifest?manifest=/json/iiif/10316.2/71724/120912/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b544e2a3-ad0b-460e-9fe5-89ac3baa12ba",
      "cw-456ed9e5-0c1d-4fdf-ad48-fcac563069ee"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e5fbeab6-5814-4dab-8053-e7e16c40437d",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/71724/120912/manifest?manifest=/json/iiif/10316.2/71724/120912/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-456ed9e5-0c1d-4fdf-ad48-fcac563069ee",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}