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/p16022coll205/335/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b553cf70-0220-49bb-bdfb-d574ac6945ff",
      "cw-13bf79b4-057b-4254-8ce5-02b40b0d3c74"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-645abcb4-3548-44c1-971e-4119ea60537d",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/335/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-13bf79b4-057b-4254-8ce5-02b40b0d3c74"
  }
}