Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/4404/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1f553c9a-2f50-4143-9450-00b8a4f9bf3a",
      "cw-453b0f61-ebd0-4b14-8b9f-0d335918948d"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-90c3a8b9-9fbb-4f3b-abae-817955bfce8c",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/4404/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-453b0f61-ebd0-4b14-8b9f-0d335918948d"
  }
}