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/p16022coll246/204/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7fb5f87b-cc54-4c79-b231-3da535bb29b2",
      "cw-fd0eb3c8-e04c-468a-b0a6-5016aace9087"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ad22e948-c1bf-4f67-a6f0-0d7a0d42fb42",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/204/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-fd0eb3c8-e04c-468a-b0a6-5016aace9087"
  }
}