Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/2D12BJd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-797c4081-9685-4f38-b9ec-d9842793d246",
      "cw-3fc1a8d1-9f91-4150-8f56-a536c7f35e30"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a05428fc-010b-4be1-aba5-8a61656853d0",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/2D12BJd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3fc1a8d1-9f91-4150-8f56-a536c7f35e30"
  }
}