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/p16022coll230/1549/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-723fd79c-6c62-46b0-a11a-789c5f03471a",
      "cw-c8c027b3-3ba2-403d-820d-808203a78ffd"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3cc6afaf-28f1-4c0f-92d7-31f28e9cba73",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/1549/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c8c027b3-3ba2-403d-820d-808203a78ffd"
  }
}