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/p16022coll205/296/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2a9f9f9d-6de8-4302-a0cc-339c24229688",
      "cw-d755673c-6ec8-4413-b75c-f11e375bfaaf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d4219ac2-672f-4821-9e9a-272cb8c8ef21",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/296/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d755673c-6ec8-4413-b75c-f11e375bfaaf"
  }
}