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-68b0609b-7225-487d-bb2f-770a10235e88",
      "cw-167886d2-1f70-46f7-8abd-33e8e6aae8ea"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-dec68903-31c2-4b67-895f-1a38bad17ad6",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-167886d2-1f70-46f7-8abd-33e8e6aae8ea",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}