Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/EdZ7byn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-209037c5-5d95-4f9d-8c38-34a16de4d8bc",
      "cw-ad4c260c-0f10-43f2-a22f-55d7804db2e9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f78e7bb4-41c5-4e45-a894-5a5699116fa4",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/EdZ7byn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ad4c260c-0f10-43f2-a22f-55d7804db2e9"
  }
}