Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/4DewJqn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-72f24476-478a-4762-9b76-a5c03f24cefe",
      "cw-8665d440-7eb5-4fae-8d63-7623055d8bd8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b1f42848-72fe-4d9f-96e2-e4644290189b",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/4DewJqn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8665d440-7eb5-4fae-8d63-7623055d8bd8"
  }
}