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/p16022coll205/263/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8260d89d-9011-42a9-8dc6-dfa8bd105c0c",
      "cw-b9f8c56d-d1b3-4208-892d-6769343f7892"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2eac2b62-eb99-4b7c-944c-a766c08be204",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/263/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b9f8c56d-d1b3-4208-892d-6769343f7892"
  }
}