Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/JQo8w7D/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4fb2924c-e5f7-4c1a-b5f9-b761f388026e",
      "cw-2758b711-a484-4356-85ca-5113beeb92bf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-af078545-7a0f-4e1b-835e-dacf3c880b90",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/JQo8w7D/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2758b711-a484-4356-85ca-5113beeb92bf"
  }
}