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/p16022coll246/184/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6ca3acca-ca5a-4d0d-a4d7-b4ae45f6325b",
      "cw-dbfd4ee1-fbed-46b8-b802-9dfd17a3a03f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-570e43e0-2d7e-4103-950e-1ecf1b2624ee",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/184/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-dbfd4ee1-fbed-46b8-b802-9dfd17a3a03f"
  }
}