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/p16022coll624/268/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ed2ec196-c736-4252-9ca9-1dffb9de6098",
      "cw-b94b5b82-78ce-4c29-9a3d-81fa7734f34f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e761a9d9-6048-4117-91c4-2e0a40d80f63",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/268/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b94b5b82-78ce-4c29-9a3d-81fa7734f34f"
  }
}