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/p16022coll246/137/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-526b856f-9dcc-4dfc-90e7-6ebf2fe07c58",
      "cw-02c14f01-df23-4b07-ad06-4fe2e448b18c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-327773d1-94a9-4b94-9a6a-92f02a0e32fa",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/137/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-02c14f01-df23-4b07-ad06-4fe2e448b18c"
  }
}