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/p16022coll289/2/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bba73650-c7b3-4490-9ae6-c13192dac7c5",
      "cw-a77b036d-03e4-4512-9394-d4974d030700"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e37faa07-d191-4b3d-a2fc-17d9711e1208",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/2/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a77b036d-03e4-4512-9394-d4974d030700"
  }
}