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/p16022coll230/2085/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bda0e84b-6d05-44b9-9891-af6b0ea24065",
      "cw-0729cf1a-123b-4f95-8e0e-55fc733e5290"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-52b6118c-99e1-49e7-bafb-481ac6f3e9bf",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2085/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0729cf1a-123b-4f95-8e0e-55fc733e5290"
  }
}