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/p16022coll205/623/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a0185363-e455-4d47-9576-02d153bc74d3",
      "cw-83fb2cc3-ce67-4784-9576-b3328db1aa6d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-dbc5e4fb-1f4e-4fb6-9841-4ef14b38a69b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/623/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-83fb2cc3-ce67-4784-9576-b3328db1aa6d"
  }
}