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/p16022coll624/805/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1d320eec-b851-4311-bc37-7e7a56d3a328",
      "cw-379ae672-5004-42d3-95cf-b4dae5398997"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7aedd153-de08-407a-bd5d-b0eb6f8b6410",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/805/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-379ae672-5004-42d3-95cf-b4dae5398997"
  }
}