Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/5776/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e774b400-8b92-4fca-81fd-0d41a7561e6d",
      "cw-764ee78b-eb6a-4402-b25a-b9336af3374a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-11495601-ec62-4683-9f39-4c7a3936860d",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/5776/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-764ee78b-eb6a-4402-b25a-b9336af3374a"
  }
}