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-6de9870a-22d3-4d86-a78a-ffa127ea353a",
      "cw-38ea3324-75d5-4973-9ece-9670f02738b1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-29010965-9ca2-4971-912e-b6cc533bb90c",
    "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-38ea3324-75d5-4973-9ece-9670f02738b1"
  }
}