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/p16022coll289/27/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-492e2d94-b2cf-4a1c-b48f-7e1310b446d7",
      "cw-491b8275-598d-4406-a179-3da353f23a96"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e56268ed-6695-4924-8d11-879535537c69",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/27/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-491b8275-598d-4406-a179-3da353f23a96"
  }
}