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/p16022coll205/237/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-83f5b1f5-af47-44ee-afce-5ef805295123",
      "cw-48761e59-3a91-432a-8ff4-97b6e4daba93"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-73129a7b-f2a7-4cc1-891e-502683858584",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/237/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-48761e59-3a91-432a-8ff4-97b6e4daba93"
  }
}