Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/20437/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c69ea0ce-0109-4515-b9ad-afefac77fb7d",
      "cw-b17bfb8c-025a-45bc-8240-e0eda1ccb671"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a11f2192-67d0-4347-a426-6b397044c197",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/20437/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b17bfb8c-025a-45bc-8240-e0eda1ccb671"
  }
}