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/p16022coll231/3127/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c5bfbae9-21f3-4e37-b6a9-526ed89d3cd4",
      "cw-5347473a-1ae5-496a-997f-36be4d07e2f9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-0ccbd275-1c6e-4d25-b084-598e93a4c93e",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll231/3127/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5347473a-1ae5-496a-997f-36be4d07e2f9"
  }
}