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/p16022coll205/655/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1e3f0a23-15b3-4f2f-8c8c-39ccd851fa66",
      "cw-eeb001d4-d8bb-4df2-aab8-86964ca80263"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8b10f20d-14da-4f6c-80c2-9a127d2a2831",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/655/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-eeb001d4-d8bb-4df2-aab8-86964ca80263"
  }
}