Mirador viewer

SyntaxError: Unexpected token 'I', "I don't kn"... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token 'I', \"I don't kn\"... is not valid JSON",
    "id": "https://iiif.participatory-archives.ch/SGV_12S_01945/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-64dcb78f-592e-4241-9a68-c01cf36d5aab",
      "cw-69307ba6-c703-454a-abb0-b93d8847c5e0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-bf240a99-6a40-4573-b8df-74beb8d2c2da",
    "manifestId": "https://iiif.participatory-archives.ch/SGV_12S_01945/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-69307ba6-c703-454a-abb0-b93d8847c5e0",
    "loadedManifest": "https://iiif.participatory-archives.ch/SGV_12S_01945/manifest.json"
  }
}