Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/21040/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b8de342f-d976-4a32-ba2b-3662c56dd5e2",
      "cw-72ae89ec-d77a-4804-b773-374b27ae64d4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6cc55f82-9e2e-4168-8623-de5f1ce74094",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/21040/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-72ae89ec-d77a-4804-b773-374b27ae64d4"
  }
}