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/p16022coll246/359/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2c576267-aa53-4182-a6ff-da2cd7de24b2",
      "cw-03d1ce83-7ad8-4254-8e64-4b67b6ef12fd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8a698b72-b30b-4941-832a-6bd4682dfd10",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/359/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-03d1ce83-7ad8-4254-8e64-4b67b6ef12fd"
  }
}