Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-15f8c577-3ada-4eba-ba3b-4bf94c010eda",
      "cw-ee162d1a-9892-4a2f-82b9-621c611d1b7b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a0f54a6a-06e2-4020-bef8-110a787340fe",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ee162d1a-9892-4a2f-82b9-621c611d1b7b",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}