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/p16022coll624/117/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fed29e65-8db8-48c1-9a7a-5dda8dff1b74",
      "cw-6c768a85-250a-4c7c-a955-2d883a0c7569"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-1f38b372-1534-4846-b465-8a349a943ccc",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/117/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6c768a85-250a-4c7c-a955-2d883a0c7569"
  }
}