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/p16022coll230/2767/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-5dcc8197-b967-46a3-8eea-5cb4b15ab672",
      "cw-88da25c7-6b01-47f3-b576-a09e2a9fbdf5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-52213ed8-9316-4052-8c2e-37adbd304822",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/2767/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-88da25c7-6b01-47f3-b576-a09e2a9fbdf5"
  }
}