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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11166537/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f18400ee-a907-48a4-bc35-913d4c7f37c6",
      "cw-63fc7eb4-539b-4c76-af55-774acc779463"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2e54bf76-c602-4633-a6a6-76b02040997e",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11166537/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-63fc7eb4-539b-4c76-af55-774acc779463",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11166537/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}