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/p16022coll246/233/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-abdc1082-990e-4c83-b10e-57719eef1216",
      "cw-318862b8-3d38-4fa4-8396-5877698e3af2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-06064c54-fc61-4ebb-9610-65e10bb71ebe",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/233/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-318862b8-3d38-4fa4-8396-5877698e3af2"
  }
}