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/p16022coll624/466/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-dde6218f-3f2b-47b3-90e1-3e8efadb6a38",
      "cw-91cebb2e-6ab8-4177-af5b-78255dce4c87"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2e05b2b2-97e1-4f60-80f2-fb5fdacb508b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/466/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-91cebb2e-6ab8-4177-af5b-78255dce4c87"
  }
}