Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503700_00021_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-32578527-2a42-4f60-a83f-5ac8b0870535",
      "cw-a117c75a-b2da-45bc-93dd-25ecd8e3bb02"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cd14e38a-2051-4548-8043-0b3c5cdb83d9",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503700_00021_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-a117c75a-b2da-45bc-93dd-25ecd8e3bb02",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb10503700_00021_u001",
      "navDate": "1855-01-05",
      "multId": "bsbmult00000678",
      "lastSearchUrl": null
    },
    "canvasIndex": -1,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb10503700_00021_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": true,
    "view": "book"
  }
}