Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10502801_00521_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b458b93e-e31f-4f7f-8677-cad64fee5cbc",
      "cw-45bd7795-98b5-440a-9d02-f6a0838f8ac9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0448cf0d-e8ce-41c6-809f-8f6339ed3bc4",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10502801_00521_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-45bd7795-98b5-440a-9d02-f6a0838f8ac9",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10502801_00521_u001",
      "navDate": "1857-05-11",
      "multId": "bsbmult00000576",
      "lastSearchUrl": null
    },
    "canvasIndex": 2,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10502801_00521_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": false,
    "view": "single"
  }
}