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/p16022coll205/759/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-74a11b80-94dc-4eb8-be67-5761015c9c86",
      "cw-3df7daf4-ef71-4d6a-9e47-2403145e4906"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-19444e0c-1f17-4f6b-ad07-2a9c324a089e",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/759/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3df7daf4-ef71-4d6a-9e47-2403145e4906"
  }
}