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/p16022coll205/610/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e2dd64da-18df-44f1-ae02-d4ca3179047e",
      "cw-aeebe44a-0daa-43b6-830c-311e8b5b8f22"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-882ee8dd-106e-4904-b56b-c53946cbf318",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/610/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-aeebe44a-0daa-43b6-830c-311e8b5b8f22"
  }
}