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/p16022coll231/43/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fd7f5f80-55e8-4d0c-b26e-76d323df9a3f",
      "cw-ca84af5a-dba6-4981-9ac9-23f115886ed4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70def433-6f55-4c9e-8e01-e8648ecc7a08",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll231/43/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ca84af5a-dba6-4981-9ac9-23f115886ed4"
  }
}