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/p16022coll230/672/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a4f51853-f03d-4c3e-9995-9ae13c7ac07b",
      "cw-5ba5134b-420d-40f6-8d1a-600afada88ae"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e6f8d512-32ec-40ae-bce1-3736109ec3cd",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/672/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5ba5134b-420d-40f6-8d1a-600afada88ae"
  }
}