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/p16022coll230/1635/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bfdbcc95-28c6-4445-be99-e9f111af54dc",
      "cw-27db6b82-c3ab-41e6-94bc-8c91db184121"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e6ea31e5-5556-435c-8a71-bf8f055d3d71",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1635/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-27db6b82-c3ab-41e6-94bc-8c91db184121"
  }
}