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/p16022coll231/38/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bb0d3f8a-b6a0-417e-8c4d-c9dace7a0ba0",
      "cw-d074b8c3-0990-411f-85bb-77372c33452d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-04a89b53-67f0-4f34-b840-5b1e7c591ef9",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll231/38/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d074b8c3-0990-411f-85bb-77372c33452d"
  }
}