Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/8DKpLVd/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e51977d6-599d-4186-9ef0-e548b8a9d557",
      "cw-0c60ff2a-5c7e-4a06-80cf-2c789e8b133c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c23fb3e7-6bc6-4cca-9ef3-abc0e6319ceb",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/8DKpLVd/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0c60ff2a-5c7e-4a06-80cf-2c789e8b133c"
  }
}