Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/22820/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9b28c27b-6e43-4e65-87a7-d169333b09f1",
      "cw-ccd216f6-2296-46fb-8836-dca830fa1096"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-bd71361c-4b1e-4678-8e44-139d327b8838",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/22820/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ccd216f6-2296-46fb-8836-dca830fa1096"
  }
}