Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504023_00521_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1df262b0-d30f-4887-bb11-6bec9e014981",
      "cw-270d9f92-cbf7-4388-9009-5224b7493550"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1285c882-847a-45cd-920c-6f3ed47999ed",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504023_00521_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-270d9f92-cbf7-4388-9009-5224b7493550",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10504023_00521_u001",
      "navDate": "1855-05-08",
      "multId": "bsbmult00000017",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10504023_00521_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}