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/p16022coll624/468/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-908e9c2e-effc-46fd-8d4f-f63a2c2d7232",
      "cw-d4fa2a14-ef85-4473-950f-2cd479dbdb63"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-5c90e2cc-9f7a-4b40-b111-e818e512606a",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/468/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d4fa2a14-ef85-4473-950f-2cd479dbdb63"
  }
}