Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/LnL051n/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cb411225-6c2c-49c5-82be-8043296733ae",
      "cw-362f8897-151a-415d-a54d-b4783912450c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-004bcfb1-867b-451e-91ba-27f94d6f80d1",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/LnL051n/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-362f8897-151a-415d-a54d-b4783912450c"
  }
}