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/p16022coll289/65/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f28c474b-b3c9-467b-ab73-776c0e4ebeb8",
      "cw-5e9641f5-a129-4ff0-bc1e-93d712d6a518"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9a20fc72-ffc9-4fac-b2ec-d6405ac05d51",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll289/65/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-5e9641f5-a129-4ff0-bc1e-93d712d6a518"
  }
}