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/p16022coll230/4000/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bc8e6d29-221f-4687-b95d-b54ab6f60824",
      "cw-1c77b11f-644f-40fe-98f3-1fa278045f1e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-27aa99e8-7dee-4a78-a951-0995d9ef8240",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/4000/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1c77b11f-644f-40fe-98f3-1fa278045f1e"
  }
}