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/p16022coll205/333/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3d22bee2-a6d1-4115-a319-ac346c524f07",
      "cw-05974d0b-db9d-4f64-8456-2d9f9295221c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-157da372-fc6c-41da-89e6-a4a024e00afd",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/333/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-05974d0b-db9d-4f64-8456-2d9f9295221c"
  }
}