Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/14820/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4d09e6db-27bd-4d7d-a1a8-476dc11dbf2f",
      "cw-35611227-d35c-4cbd-b556-404387c96a65"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-c0acde9b-e415-4861-bd58-1afa2f66106d",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/14820/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-35611227-d35c-4cbd-b556-404387c96a65"
  }
}