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/p16022coll230/890/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a2d719ba-ecc2-4bb6-92ff-deeef7273aaf",
      "cw-2ee7a395-1e9c-44f1-8fb6-545f037c233a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8fcce1ae-da20-4932-95a4-31d9b032338b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/890/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2ee7a395-1e9c-44f1-8fb6-545f037c233a"
  }
}