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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304990/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8caea27a-5d74-4060-8ece-efd7b223c201",
      "cw-041b1625-bbbc-49d0-a13c-16971392816b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e40c2735-0847-4455-9781-66c03f11c6d7",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304990/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-041b1625-bbbc-49d0-a13c-16971392816b",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304990/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}