Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00091975/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6e1a9b79-926b-41d3-a454-7cbf4bf7258c",
      "cw-ad094afb-1eb4-4957-a048-9a5f5f48392c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ecabcd86-5c6e-4fca-a2b5-c96dc884a7ac",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00091975/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ad094afb-1eb4-4957-a048-9a5f5f48392c",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": -1,
    "dfgViewerUrl": "https://dfg-viewer.de/show?tx_dlf%5Bid%5D=https%3A%2F%2Fapi.digitale-sammlungen.de%2Fdfg%2Fmets%2Fmods%2Fv1%2Fdigitalobjects%2Fidentifier%2Fmdz-obj%3Absb00091975",
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00091975/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}