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/p16022coll205/257/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e9a21a31-9a15-455e-967b-6e96e0f77749",
      "cw-5b0f8d2a-5d7e-42bf-96af-929aad9f49d9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fed828c0-8ed0-44fb-b8db-30952199e0a4",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/257/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5b0f8d2a-5d7e-42bf-96af-929aad9f49d9"
  }
}