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/p16022coll205/323/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-29c2e663-ee61-43b4-ae26-067d4fb16a91",
      "cw-006a1991-ce3c-43ba-a231-af35fa9faa31"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-490b0420-7c35-4012-99f6-f09bf30d1886",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/323/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-006a1991-ce3c-43ba-a231-af35fa9faa31"
  }
}