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/p16022coll230/2522/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-58738760-a469-4b00-8357-e7a89687997a",
      "cw-209e99c4-a7ac-4ecc-b134-d64b9f8cc4d1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1da14954-7145-4616-ae56-1a52b49085cf",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2522/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-209e99c4-a7ac-4ecc-b134-d64b9f8cc4d1"
  }
}