Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/JQo6wKn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-950f37cb-0178-496d-b260-a53d61d63b51",
      "cw-6017af7e-da8f-4cd1-8fd1-17c9848419e4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-752fe196-64cf-4b20-9b86-f6005f10ce45",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/JQo6wKn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6017af7e-da8f-4cd1-8fd1-17c9848419e4"
  }
}