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/p16022coll230/2504/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-bb5254a8-b158-47fc-ae8b-2c1bf0bfec93",
      "cw-7ff1b2cf-9ba4-411a-90a5-3675195c058d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-942d58ab-621a-488d-aa7e-ff28369288ed",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2504/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7ff1b2cf-9ba4-411a-90a5-3675195c058d"
  }
}