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/p16022coll229/2295/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d008a4d1-607d-4384-a7d0-19722f9d36ee",
      "cw-9b33c511-be1e-477c-8b1e-046b5ecf0d67"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7913342c-7853-410f-b285-846d1aac7399",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll229/2295/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9b33c511-be1e-477c-8b1e-046b5ecf0d67"
  }
}