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/p16022coll230/4197/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9b2aaca1-2bfc-42d7-9dd3-a414205fc02d",
      "cw-f5689136-246a-4fd4-8b77-00e0457ad58c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-01f4cd81-b512-4dc5-924d-5834995beae5",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/4197/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f5689136-246a-4fd4-8b77-00e0457ad58c"
  }
}