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/p16022coll230/2495/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-62137d17-5818-4d71-ae3a-94467653cb02",
      "cw-beb35b46-871d-4401-8b8d-3dfbcd0c0a4a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-72328d14-f2fe-4ef2-89d8-c5eb59e0d8db",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2495/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-beb35b46-871d-4401-8b8d-3dfbcd0c0a4a"
  }
}