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/p16022coll230/2736/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9722a0d2-bf50-42cb-8e3c-841e3a100adb",
      "cw-72634b02-8667-4e0c-8219-53124428f371"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f0dba92e-2ade-4d10-8b59-ee787aa67151",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2736/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-72634b02-8667-4e0c-8219-53124428f371"
  }
}