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/p16022coll230/548/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4d26d61a-fea6-48f4-879b-e019ea659918",
      "cw-832db97c-7278-4f28-a2b4-e97fb2f5a73c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1049bfc4-ea67-43a0-96a2-c84cbe178e43",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/548/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-832db97c-7278-4f28-a2b4-e97fb2f5a73c"
  }
}