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/p16022coll624/271/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-195afab4-dd4c-43bd-8685-9927f13ffa38",
      "cw-a554a1f5-a38b-44d4-a192-b28f58667132"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-84eb3894-e5d4-4685-a3b0-b0f6200c04c4",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/271/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-a554a1f5-a38b-44d4-a192-b28f58667132"
  }
}