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/p16022coll230/1681/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0386bc84-93e2-4c13-ad6b-8babbea6dcb6",
      "cw-83b2333e-7686-41b2-8585-111e2b68627a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b143ae9e-6e50-4213-9fb8-8cd7d1c1513f",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1681/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-83b2333e-7686-41b2-8585-111e2b68627a"
  }
}