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/p16022coll624/305/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e1e90703-8c0e-485f-9128-2f6ffd62e643",
      "cw-c7a293b4-204c-4d4b-a46b-eebc5dfc81cf"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-13d93f1e-185a-4b1d-8237-19c00944ee92",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll624/305/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c7a293b4-204c-4d4b-a46b-eebc5dfc81cf"
  }
}