Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://iiif.participatory-archives.ch/SGV_12N_21752/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e2f1b465-25d8-4c22-9945-59255163ecc5",
      "cw-2233103b-2149-4469-b9bf-fbb70290b795"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-da505e94-5973-4f0f-bca8-099db5dfb276",
    "manifestId": "https://iiif.participatory-archives.ch/SGV_12N_21752/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2233103b-2149-4469-b9bf-fbb70290b795",
    "loadedManifest": "https://iiif.participatory-archives.ch/SGV_12N_21752/manifest.json"
  }
}