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/p16022coll624/128/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-949841db-33bf-4dd2-909c-ee6978d06d87",
      "cw-01e88f45-d3da-44d3-afd0-e8af73a5122c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b9a27c28-f087-4a8b-ab8d-c0fa56598820",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/128/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-01e88f45-d3da-44d3-afd0-e8af73a5122c"
  }
}