Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/4306/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7ea23a0c-8031-4284-bf11-c5133fb6fc15",
      "cw-02730107-c4da-4ef8-a69e-c6262b97889a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c971c1ce-8b78-4c78-812d-83b20192efb5",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/4306/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-02730107-c4da-4ef8-a69e-c6262b97889a"
  }
}