Mirador Viewer

TypeError: Failed to fetch

{
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    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503721_00437_u001/manifest",
    "isFetching": false
  },
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    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
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    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-250320c1-ed92-4131-8e0d-8f67add5dd5b",
    "thumbnailNavigationPosition": "far-right",
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    "calendarNavigation": {
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      "navDate": "1864-03-04",
      "multId": "bsbmult00000678",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503721_00437_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}