TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/milosc_z_listy_przeb_1_manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-6e2bd0e7-6a9d-4c81-beba-01a8e44b3fdd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f6af5e53-9b4f-4240-8549-f2269ee3f097",
    "manifestId": "https://www.fina.gov.pl/manifest/milosc_z_listy_przeb_1_manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6e2bd0e7-6a9d-4c81-beba-01a8e44b3fdd",
    "view": "single"
  }
}