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/p16022coll230/3409/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-030691fb-3dcd-4f4b-ab9e-7abc27d13992",
      "cw-5a3e18fb-f84a-490c-a206-e3156ae38dc0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-84709ff1-b962-4960-b765-43d04c19c915",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/3409/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5a3e18fb-f84a-490c-a206-e3156ae38dc0"
  }
}