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/p16022coll205/633/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1b2c69c1-d73c-47b2-a679-6c4df3b0f4b2",
      "cw-1c2cfc78-7dd5-45f4-a865-3e21783213cc"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-30264b83-f384-4fdc-b989-2ef7795b4c8f",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/633/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1c2cfc78-7dd5-45f4-a865-3e21783213cc"
  }
}