Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.sma.unibo.it/smaunibo/containers/5dGvx3D/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bd255e32-d614-4d66-a704-ce76bab0fd04",
      "cw-318adeb2-7945-404c-8b2c-f4a1c5eaeb07"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-37bbfe9c-13da-447d-989e-20a16257cb8c",
    "manifestId": "https://dam.sma.unibo.it/smaunibo/containers/5dGvx3D/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-318adeb2-7945-404c-8b2c-f4a1c5eaeb07"
  }
}