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/p16022coll231/48/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-248197e3-a594-4a88-a8bd-5feebad8a762",
      "cw-7ad77531-bb54-47b3-acf5-5ff3d16f6b2b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-17806eba-b1e7-4f54-acdc-efed59331918",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll231/48/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7ad77531-bb54-47b3-acf5-5ff3d16f6b2b"
  }
}