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/p16022coll229/3210/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-967f5011-93b5-4006-8ad7-5df7c4bb99d6",
      "cw-d3eb5f5e-67e9-4815-ba87-92b7d099f667"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ece9ded8-6ba4-40b6-9bc9-f13c05cd1580",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll229/3210/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d3eb5f5e-67e9-4815-ba87-92b7d099f667"
  }
}