Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503939_00521_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9a75a64e-8be8-4069-843b-1ba0b4999763",
      "cw-5fb69ee8-2716-4670-abc8-9245fd9f115d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d7f0e2f2-6226-40bc-bb8f-5e15caa018f2",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503939_00521_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-5fb69ee8-2716-4670-abc8-9245fd9f115d",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10503939_00521_u001",
      "navDate": "1868-05-29",
      "multId": "bsbmult00000559",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503939_00521_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}