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/p16022coll230/2498/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-09e3f51c-950d-42a2-9a86-ed6589b1bd97",
      "cw-3fd1dc16-b89a-4263-9113-ec2be317419c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-05a6615a-04d8-4add-91ac-65c3fed61aaf",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2498/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3fd1dc16-b89a-4263-9113-ec2be317419c"
  }
}