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/p16022coll205/487/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3abde673-d917-4d14-83fc-af7a601293e6",
      "cw-6b541e3a-5087-4ade-8d96-c2033ed406d2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-98ec793e-2b91-4683-b4d8-14a668ee35c2",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/487/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6b541e3a-5087-4ade-8d96-c2033ed406d2"
  }
}