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-d0db6914-6b74-4d1b-bf22-f5d4f57506c8",
      "cw-8fb19861-8471-4828-9ce4-ff4e0414671c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-354f2b03-0186-460d-a232-4ce34b9afd5a",
    "manifestId": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8fb19861-8471-4828-9ce4-ff4e0414671c",
    "loadedManifest": "https://www.rammses.it/wp-content/manifestoso.json?type=sbn",
    "canvasIndex": 15
  }
}