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/p16022coll230/2691/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ea3f3024-1d07-4946-bfd3-043867dd53d0",
      "cw-db6dd869-3fb4-4300-b64c-1a9ad3d8521a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-65191912-0379-4ee2-9b3c-0397596a211d",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2691/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-db6dd869-3fb4-4300-b64c-1a9ad3d8521a"
  }
}