Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503168_00520_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-89705848-f6ee-4a88-9638-18228cb2d9a9",
      "cw-fce95aeb-e6b6-4fee-9913-6ce6b983a591"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ae6c291f-19d3-4ed6-8221-ce84e1e24c6f",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503168_00520_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-fce95aeb-e6b6-4fee-9913-6ce6b983a591",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10503168_00520_u001",
      "navDate": "1815-01-01",
      "multId": "bsbmult00000550",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503168_00520_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}