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/p16022coll246/329/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-82f5ecc2-a192-4854-9aa5-0bb856e95228",
      "cw-6dbdc72a-bf26-4aeb-a6b2-e3cdd824d403"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9dec7e09-4ebd-4c76-a5c2-05477efbaa41",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/329/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6dbdc72a-bf26-4aeb-a6b2-e3cdd824d403"
  }
}