Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/11871/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2fd5c237-cb14-4c25-9da8-e44654e1fdb2",
      "cw-e19d8d9b-ca0c-4462-9f80-fd27c03baf3a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-61d956fd-70b0-4317-8cf8-cb7c57736d50",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/11871/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e19d8d9b-ca0c-4462-9f80-fd27c03baf3a"
  }
}