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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-109e4414-91e1-4a2f-a22d-001c9b79504a",
      "cw-b2bdbe12-d875-4dd8-baf3-909fda2cffb6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a1556db4-1056-4d8b-b184-e907fc691535",
    "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-b2bdbe12-d875-4dd8-baf3-909fda2cffb6",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}