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/p16022coll624/131/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1e669dc6-d0a5-4ab7-83ca-d86eee71958e",
      "cw-aee1f210-ad2d-414c-8908-9a8d5ffc3ad7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2bc2b3c2-6a9c-48cb-9c84-4a52499d0a2f",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/131/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-aee1f210-ad2d-414c-8908-9a8d5ffc3ad7"
  }
}