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_01085/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2fc7cfe0-f6c5-4c77-8de5-5723c92503b4",
      "cw-6ebf8884-2f52-4fbe-8d19-1ed70b0e12f4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6fb72862-ba60-4537-bae0-b333a890fbf1",
    "manifestId": "https://iiif.participatory-archives.ch/SGV_12S_01085/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6ebf8884-2f52-4fbe-8d19-1ed70b0e12f4",
    "loadedManifest": "https://iiif.participatory-archives.ch/SGV_12S_01085/manifest.json"
  }
}