Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504140_00521_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3280a5c4-7d00-4a4c-a367-9b6dad221192",
      "cw-cff23516-f1c5-4975-8b7f-2916773b8e0e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5aace188-e41e-4511-a9ef-c7cdedf0f6f4",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504140_00521_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-cff23516-f1c5-4975-8b7f-2916773b8e0e",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10504140_00521_u001",
      "navDate": "1841-08-11",
      "multId": "bsbmult00000506",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504140_00521_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}