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/p16022coll230/2075/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8df0b236-0457-41c0-ad65-7b9a355aeb03",
      "cw-1bdd3b40-c9c0-4491-ae8a-fdfcd0b704b1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d5d0fc2a-086a-4fba-9cad-0b803b95ebd9",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2075/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1bdd3b40-c9c0-4491-ae8a-fdfcd0b704b1"
  }
}