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/p16022coll205/744/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-05eb4c28-a70c-47d8-accf-b8a325468c2b",
      "cw-7183f1c3-5648-4291-99e1-196b0ddd0045"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-67fba489-8c87-42a6-abfa-8ff0ad5128b6",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/744/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7183f1c3-5648-4291-99e1-196b0ddd0045"
  }
}