Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xQMRpvD/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ad4340fc-89b2-4349-b987-0cfe20200569",
      "cw-1d3217cc-167f-442e-b5ef-fb9d369b2b3b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f583da73-4a28-4f26-8f2a-04a36ef28c1e",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xQMRpvD/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1d3217cc-167f-442e-b5ef-fb9d369b2b3b"
  }
}