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/p16022coll246/163/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d1e158ac-5ea8-4489-892b-15e4812ca0fc",
      "cw-130af0bc-44f4-4475-a13a-3e6a7f8fa5d1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-ee20481f-bc61-4488-8035-7eb6105e2b1c",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/163/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-130af0bc-44f4-4475-a13a-3e6a7f8fa5d1"
  }
}