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/p16022coll624/142/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-89573e45-81cd-4b9f-9051-c6eac24422a5",
      "cw-d6039d8d-0ae7-4d77-aa3b-b6a3859c06a0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e81cd316-eea5-4fce-8ab3-f8c170c32966",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/142/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d6039d8d-0ae7-4d77-aa3b-b6a3859c06a0"
  }
}