Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/8352/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a9f188d8-0e83-4d57-813a-b19efff3cc58",
      "cw-dc68636b-4f10-40dd-af55-e50cb2cdb237"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e4a7fd29-7730-4c2a-8db5-46b2324c2bce",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/8352/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-dc68636b-4f10-40dd-af55-e50cb2cdb237"
  }
}