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/p16022coll230/4193/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d660d639-6b9a-49e8-831e-9bbcefafd737",
      "cw-156f2d43-09c5-45af-bf0f-7fd2bfebf1e2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d91fff2f-7cba-40eb-b816-f810603dc3d3",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/4193/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-156f2d43-09c5-45af-bf0f-7fd2bfebf1e2"
  }
}