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/p16022coll624/110/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8f0ed541-13d1-4fce-9490-397c12754f03",
      "cw-b47ef2a7-4080-42a7-8f74-a423efd00206"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3df175b2-2e38-4505-807c-1bfa6b6d787b",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/110/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b47ef2a7-4080-42a7-8f74-a423efd00206"
  }
}