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-4c6a485e-e9be-4222-aa8c-d17c5fae7463",
      "cw-5485cfc8-b67f-42d2-9046-99902b0f590f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-06a8790a-d844-4e63-959e-5985e99a9da7",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5485cfc8-b67f-42d2-9046-99902b0f590f",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}