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/p16022coll205/504/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e79ac2c5-a366-417f-8402-ae9894a5f1a2",
      "cw-14e6e53f-ca98-406c-ac06-b5de44a2eb2d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fa344748-54b4-4d03-bd30-34453ad81ac4",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/504/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-14e6e53f-ca98-406c-ac06-b5de44a2eb2d"
  }
}