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/p16022coll246/425/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2c438d45-41e6-4167-b8d6-5528d81cfe6d",
      "cw-8dfa23fc-c083-4afc-bf4a-8dce3c51d43c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fb34e16c-48b8-4292-96e9-6204eb1383df",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/425/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8dfa23fc-c083-4afc-bf4a-8dce3c51d43c"
  }
}