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/p16022coll289/12/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c5a54c6d-4882-427e-888a-6089d3947a7a",
      "cw-1757a34f-3cae-421b-a7b9-1530158de9e7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1c9b233b-1a2b-4bee-9733-79ee8f410c2b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/12/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1757a34f-3cae-421b-a7b9-1530158de9e7"
  }
}