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/p16022coll624/111/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-77808e27-fcf4-4f68-a1f0-42f9418f7c4b",
      "cw-f76079c2-2471-4f38-9740-e5c45c02ead3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-2d2f60a3-a4d4-4b24-9701-569feecfd8b4",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/111/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f76079c2-2471-4f38-9740-e5c45c02ead3"
  }
}