Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/4379/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9bbd0a25-0657-4749-b8a1-ddf4f6460451",
      "cw-b2bf82de-cd26-48b4-8bbb-77c8c1451fde"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-70a5dad8-9352-49ba-a18c-dec27bc53ebb",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/4379/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b2bf82de-cd26-48b4-8bbb-77c8c1451fde"
  }
}