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/p16022coll205/388/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d84ac07d-206a-4d2c-b980-a37e09be5813",
      "cw-d88410bf-fddb-4269-b1b7-a83d5fe81896"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ca1274d1-62a7-49c6-895c-0561c244d475",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/388/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d88410bf-fddb-4269-b1b7-a83d5fe81896"
  }
}