Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Pxad/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-36f25b26-8e58-45d2-93ca-2c3e768931ef",
      "cw-55d6430c-d000-4ee8-9534-b3d311bd3dfb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-89222030-4027-4242-8496-ee7dfa485a73",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/Zn5Pxad/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-55d6430c-d000-4ee8-9534-b3d311bd3dfb"
  }
}