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/p16022coll205/479/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b8cbdeb9-998e-4329-8b4b-f1174695bdd5",
      "cw-859ffa46-70c3-4f11-8ae2-c342dfb73e7c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-295972ea-b032-44ec-81f8-241dfcdc312c",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/479/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-859ffa46-70c3-4f11-8ae2-c342dfb73e7c"
  }
}