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/p16022coll230/2560/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cd2fdfe6-c65e-4bc0-9749-0a80949688a6",
      "cw-8a643b1d-25e6-4f00-a592-0c75e1f9a13f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-edf4b459-d712-4d00-b77e-5fa108e51bd0",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2560/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8a643b1d-25e6-4f00-a592-0c75e1f9a13f"
  }
}