Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/YQlJbVd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f70c41af-87a2-4f7a-9fb3-94e5de2b3468",
      "cw-bec0e109-5aff-43b4-a9de-621dc7e0ba4e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0d860964-f6c4-408a-8a78-f0181dc788d0",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/YQlJbVd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-bec0e109-5aff-43b4-a9de-621dc7e0ba4e"
  }
}