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/p16022coll230/3364/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b3630179-ea30-4633-9ae1-2f82fe5a89ec",
      "cw-46da94ea-9f8d-454d-ae7e-7b1cdab67d26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a2cd701c-d7e0-4ac4-a737-67bed43f834e",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3364/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-46da94ea-9f8d-454d-ae7e-7b1cdab67d26"
  }
}