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/p16022coll230/562/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-fbab24ad-32c5-4795-9511-2493b409371c",
      "cw-69f2b00b-721f-4c39-83b4-af052cf9e287"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-db8771aa-2d24-48c4-8ff3-cdc7744fa290",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/562/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-69f2b00b-721f-4c39-83b4-af052cf9e287"
  }
}