TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://www.fina.gov.pl/manifest/P17718-1-B.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
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    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5e016d50-668e-47e8-b215-471455c0236c",
    "manifestId": "https://www.fina.gov.pl/manifest/P17718-1-B.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-584585b9-d002-44ae-9c6a-af95762e7559",
    "view": "single"
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}