Mirador Viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012869_00921_u001/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-af79de2b-70bc-49b8-a158-19f1464975f9",
      "cw-c8e16b72-53ca-4437-bc35-fc0a2a155614"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b2f293c8-1aba-4e74-9eca-23ddfc3c801a",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012869_00921_u001/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "calendar",
    "thumbnailNavigationId": "cw-c8e16b72-53ca-4437-bc35-fc0a2a155614",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "calendarNavigation": {
      "issueId": "bsb00012869_00921_u001",
      "navDate": "1849-09-12",
      "multId": "bsbmult00000806",
      "lastSearchUrl": null
    },
    "canvasIndex": 0,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00012869_00921_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": false,
    "view": "single"
  }
}