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/p16022coll230/1680/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3aad0c5e-10c4-45b7-9664-da34cdd1f928",
      "cw-3e557f59-9325-47ca-af0f-1d39f0ba640f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-981e355e-8642-442e-a7d7-bd2f756c7de0",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1680/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3e557f59-9325-47ca-af0f-1d39f0ba640f"
  }
}