Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/vdmvmEn/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-98378adf-baee-4680-8ea6-feee9d011a77",
      "cw-ed7cace2-70db-4f29-8de6-788e2c3219ab"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5d93be04-2419-420a-a0bd-a8fdbee4b69a",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/vdmvmEn/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ed7cace2-70db-4f29-8de6-788e2c3219ab"
  }
}