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/p16022coll246/116/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7e40d8d6-c219-41fa-a9f7-eeb908dea031",
      "cw-e907a379-4118-49b4-9ffb-1f1833dc4a26"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-669f413b-0f93-4993-8708-80e88c391ebc",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/116/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e907a379-4118-49b4-9ffb-1f1833dc4a26"
  }
}