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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304677/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6be8ca44-476b-4e0e-b0ce-4965c7d80743",
      "cw-90a80bcf-71eb-46ff-bc7b-80577bab1101"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-16bd5bc4-2acb-42eb-8440-af793dcbff03",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304677/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-90a80bcf-71eb-46ff-bc7b-80577bab1101",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11304677/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}