TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/P7771-1-B.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-392cbbc4-2a7d-4b32-9d7e-1a3d9a488e9c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2998619a-ef2d-4407-bb6c-d2a626d35649",
    "manifestId": "https://www.fina.gov.pl/manifest/P7771-1-B.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-392cbbc4-2a7d-4b32-9d7e-1a3d9a488e9c",
    "view": "single"
  }
}