Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/xnAP8Pd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7602faa0-5a09-4377-a671-d919449a37d5",
      "cw-517da9b8-ce8d-4ec0-8d70-d79b6602885b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-733e71fd-1605-435a-924b-f1caa9ea6933",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/xnAP8Pd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-517da9b8-ce8d-4ec0-8d70-d79b6602885b"
  }
}