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/p16022coll230/1667/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2ae0d6e6-5f51-4a6a-b183-b0d794242654",
      "cw-5b076890-7468-409e-9a00-57ec771fbaab"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-54ec6de6-6785-4958-adc4-96dc64c51003",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1667/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5b076890-7468-409e-9a00-57ec771fbaab"
  }
}