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/p16022coll230/2037/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-d85f001a-b1bd-4c9a-a9dc-adc6128748c4",
      "cw-3e082701-cd12-4083-aee6-4e49fe8807db"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a48ca698-c4b6-462d-82b4-2f18a9076382",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2037/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3e082701-cd12-4083-aee6-4e49fe8807db"
  }
}