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/p16022coll230/2872/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-14b353ef-5a6f-46db-8678-872fc9325389",
      "cw-a308b6c9-4a87-48c1-bc90-b14827401acb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-81f6d97d-4545-4a9d-b9e5-503e0da41f3a",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2872/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a308b6c9-4a87-48c1-bc90-b14827401acb"
  }
}