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/p16022coll205/742/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1f484f89-1ae8-4524-a837-8333d4c85685",
      "cw-13634b5c-0c8d-48ce-8343-7e81de19f61a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-db6fa655-82d7-4019-a63e-a25691cd349a",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/742/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-13634b5c-0c8d-48ce-8343-7e81de19f61a"
  }
}