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/p16022coll624/795/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-07c74328-32d2-4fd6-a6ff-e557f17cf910",
      "cw-752b6985-b811-4b94-a6b9-ce02b7150659"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-18d919ec-f42d-43c0-9929-6a03a2d99d7c",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/795/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-752b6985-b811-4b94-a6b9-ce02b7150659"
  }
}