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/p16022coll205/252/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-68b6fd3c-bb1a-4b19-af44-78070e41c00b",
      "cw-322f8596-068b-4808-9933-b625c1b9a8e5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-af19b903-0804-47e4-a78d-92c0c3a143c7",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/252/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-322f8596-068b-4808-9933-b625c1b9a8e5"
  }
}