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/p16022coll229/983/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6193fb7c-7579-4330-ae6a-a8849abb6911",
      "cw-23f4f443-f885-4d8c-8fde-91c5a58785f4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-af1b88a8-ec43-4529-8752-1c8b2273b025",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll229/983/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-23f4f443-f885-4d8c-8fde-91c5a58785f4"
  }
}