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_01982/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-41e9db3f-70e0-4bd5-ae4c-24c6c3c686be",
      "cw-45ba7d9f-94e4-4557-b828-7ec35ec9d70b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-193610da-25c7-413e-bc16-0b77af712e95",
    "manifestId": "https://iiif.participatory-archives.ch/SGV_12S_01982/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-45ba7d9f-94e4-4557-b828-7ec35ec9d70b",
    "loadedManifest": "https://iiif.participatory-archives.ch/SGV_12S_01982/manifest.json"
  }
}