Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/0Q43Een/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8531fe28-8393-4a05-8feb-f454eea2ec55",
      "cw-7a6fc10d-96ad-43bc-9aec-724a40ad117b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4a73951e-c171-4e2a-b80f-804edc772251",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/0Q43Een/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7a6fc10d-96ad-43bc-9aec-724a40ad117b"
  }
}