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/p16022coll230/4006/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-86c99020-dc1f-4963-ad79-b1b641cd7ef2",
      "cw-2bb374f6-f2ab-48fe-bbc9-65083d1a9a22"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-05fe5394-2ba9-4445-b9ec-09b965a0c629",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/4006/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2bb374f6-f2ab-48fe-bbc9-65083d1a9a22"
  }
}