Mirador viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3512/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-675df849-a4d6-486f-b3b4-cbc02c19138f",
      "cw-8cbf2c33-b6a9-492e-8f94-bd5ee1ab0f26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c25ace4d-a645-4cda-acd7-811f1f873cb5",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3512/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8cbf2c33-b6a9-492e-8f94-bd5ee1ab0f26"
  }
}