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-82664b2d-1392-4448-aec5-3cf5667f39cd",
      "cw-c8d6f0ae-26be-4170-ac4b-65ca3fd1c77f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3150aada-4db5-464d-9af2-ab1bb2467304",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c8d6f0ae-26be-4170-ac4b-65ca3fd1c77f",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}