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/p16022coll246/245/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-727793a8-dc8e-4bd0-856e-a5298af25f7a",
      "cw-241bf328-1471-4689-997e-b56a4ee0c7f9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-def90f5d-1522-43b3-b681-33c6cdfc0a3f",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/245/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-241bf328-1471-4689-997e-b56a4ee0c7f9"
  }
}