TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/RZnXhtuY_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-20b7de67-e255-4104-aeb6-0f86eb5c4eb8",
      "cw-a1a4a28e-1c82-4bf3-bd77-ba2df8004937"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-697a8494-22f2-44c2-8d25-d348f3565fc7",
    "manifestId": "https://www.fina.gov.pl/manifest/RZnXhtuY_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a1a4a28e-1c82-4bf3-bd77-ba2df8004937",
    "view": "single"
  }
}