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/p16022coll230/595/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f72cceee-8deb-445a-9394-de42f54f98a7",
      "cw-2481c009-50c8-4767-a47c-789142074054"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e855c42f-c7fe-4962-8085-bf6db8b92d5d",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/595/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2481c009-50c8-4767-a47c-789142074054"
  }
}