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/p16022coll624/151/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0d72ac64-cf68-4e42-8d8d-c26e36277632",
      "cw-d64e8992-c400-412c-bd26-844f09b23807"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b610b96e-915e-4dae-96bf-f07e1e142a19",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/151/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d64e8992-c400-412c-bd26-844f09b23807"
  }
}