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-4409d29a-3b8b-41d1-a309-8cf0513238e1",
      "cw-84ca76c1-8a51-4e9a-9749-734bc937dab8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-167768cc-0101-4cde-94bd-b88b0b983305",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-84ca76c1-8a51-4e9a-9749-734bc937dab8",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}