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/p16022coll246/191/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1d85f21c-6053-4e58-86d2-3035b540b732",
      "cw-4b484b91-8d4d-49ce-ac79-4a358e568c0a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7e2f850c-e5a7-4633-86fb-c3491692b942",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/191/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4b484b91-8d4d-49ce-ac79-4a358e568c0a"
  }
}