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/p16022coll230/2516/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-5a48c208-3ca2-4056-a334-4d32d6e7d617",
      "cw-3ee5f498-58ee-469a-a1a9-663e841dc282"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-bdbb7bd4-de29-4d6b-80ac-781ed4422b06",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2516/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3ee5f498-58ee-469a-a1a9-663e841dc282"
  }
}