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/p16022coll624/118/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ac9dfbda-fd74-479a-ae3f-5f23e88015eb",
      "cw-c6d10e46-f472-48b2-9a69-11105023b8a8"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4fde39ad-3fba-4c80-8565-46c9180b5014",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/118/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c6d10e46-f472-48b2-9a69-11105023b8a8"
  }
}