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/p16022coll624/392/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f147cf69-1b1f-4052-b7bf-13632aed343e",
      "cw-01201925-08dc-45bb-8d06-0e4203c414d9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-033ced3d-eb1b-4d22-9c28-ad63cf25193c",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/392/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-01201925-08dc-45bb-8d06-0e4203c414d9"
  }
}