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/p16022coll246/409/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2df41253-ed81-4555-ac7b-922c172b4487",
      "cw-06c08c82-6c02-4c2d-b348-591d4652ff27"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c69b58b0-557c-4c00-8d3a-11ddb01cd377",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/409/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-06c08c82-6c02-4c2d-b348-591d4652ff27"
  }
}