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/p16022coll230/356/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-688b7ba3-91df-4b31-b2ae-9afd8b121830",
      "cw-79d31c22-3168-43e3-a867-3bf9d1669239"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8f0bc6d0-ed5f-431f-89b8-ef9bf9522dc3",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/356/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-79d31c22-3168-43e3-a867-3bf9d1669239"
  }
}