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/p16022coll230/2565/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1b9fd6bb-a0b3-4390-bbfe-bbf0d329ba15",
      "cw-61e8e32e-65ab-46c8-ad63-18ca74b36ded"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-dc4a40a1-d2d6-4605-bb9f-e13a7fa07522",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2565/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-61e8e32e-65ab-46c8-ad63-18ca74b36ded"
  }
}