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/p16022coll624/151/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c8999ab5-1b45-426c-a339-2cfdf4b5e675",
      "cw-1a06a2c3-fd9d-439a-a96f-b46b8451f87b"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70bd49eb-5275-48c9-8314-864a8863da35",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/151/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1a06a2c3-fd9d-439a-a96f-b46b8451f87b"
  }
}