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/p16022coll624/325/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-493f2d1d-ba23-40ff-a005-cbd5f4d5821f",
      "cw-969e99cc-8a80-4d0f-96c7-8ae0f05415b1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-57722b10-4537-4eb1-846d-45a5bac82c3e",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/325/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-969e99cc-8a80-4d0f-96c7-8ae0f05415b1"
  }
}