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/p16022coll230/466/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c3bf4ce3-2ece-4402-9cb8-51f6cdc879e3",
      "cw-e425a413-c523-4aa1-b9de-f1f08d50c44e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1189f29f-e13b-4062-a071-0a297f61d645",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/466/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e425a413-c523-4aa1-b9de-f1f08d50c44e"
  }
}