Mirador Viewer

TypeError: Failed to fetch

{
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    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012806_00515_u001/manifest",
    "isFetching": false
  },
  "window": {
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    "companionWindowIds": [
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    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012806_00515_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-8f5bd365-9742-48f0-8486-4291e333209a",
    "thumbnailNavigationPosition": "far-right",
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    "calendarNavigation": {
      "issueId": "bsb00012806_00515_u001",
      "navDate": "1849-06-04",
      "multId": "bsbmult00000812",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012806_00515_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}