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/p16022coll624/115/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1f1c1ab9-261b-4835-9a07-f63fab8c97d8",
      "cw-44e0fe7d-6ed8-40ee-9f76-53c975be472b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e84ad91e-12be-4c03-a216-b4b86e4dbe88",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/115/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-44e0fe7d-6ed8-40ee-9f76-53c975be472b"
  }
}