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/p16022coll624/302/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cc473c05-be3f-436c-bf74-fd4541a68cdb",
      "cw-56ae1197-bbca-4c7a-a0f0-fa57eb114cc7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-d52d2670-18d4-4728-a7b6-543356f2ceac",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/302/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-56ae1197-bbca-4c7a-a0f0-fa57eb114cc7"
  }
}