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/p16022coll205/489/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cb05f7d0-0d8e-4aa6-8f3c-48e5be16fbf6",
      "cw-6969d30f-a13c-4750-9afa-84b1310753bd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d6ad2479-2b43-449b-b4e4-2ba1117c84b2",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/489/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6969d30f-a13c-4750-9afa-84b1310753bd"
  }
}