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/p16022coll205/494/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ee289f1f-57e6-4b38-b65e-1832d931b5a3",
      "cw-8ebe6516-f2b3-4239-be23-de7991922bbe"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-095c0651-5707-4f20-9c1d-adf0c0ea9979",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/494/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8ebe6516-f2b3-4239-be23-de7991922bbe"
  }
}