Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/rD6EENQ/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a77a279b-e11e-4165-b515-b29d6ac5bb89",
      "cw-d0d037ac-8ce0-44f6-b622-9119e1aca894"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b57fc35d-b549-4895-aada-f2fbcbee5b90",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/rD6EENQ/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d0d037ac-8ce0-44f6-b622-9119e1aca894"
  }
}