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/p16022coll289/24/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-02e26776-ba2f-4754-aaf7-3baf4904b1ba",
      "cw-d5acd8a6-82ae-41cf-8758-30942cee1b00"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f0770a6c-526c-45c9-84d9-015c754a76c9",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/24/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d5acd8a6-82ae-41cf-8758-30942cee1b00"
  }
}