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/p16022coll624/867/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b8739635-eea9-4ca5-924e-38af15c92289",
      "cw-a30487e6-88c1-488b-87e8-cce02451c1fa"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6a9f3a45-15d3-4212-ad1e-792207e2fdff",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/867/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a30487e6-88c1-488b-87e8-cce02451c1fa"
  }
}