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-8e7d9a31-c35b-412d-b20a-3756136cded7",
      "cw-962a41e6-0733-43a6-842e-15c003c165ba"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b0ea9f12-425c-4986-90e7-5e2aea97b40a",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-962a41e6-0733-43a6-842e-15c003c165ba",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}